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Finding the Fourth Proportional to 38,991.40, 58,487.10 and 21,495.40

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Solution

The fourth proportional to 38,991.40, 58,487.10 and 21,495.40 is: 32,243.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,991.40 : 58,487.10 = 21,495.40 : x
  2. Step 2: Convert to fraction form
    38,991.40/58,487.10 = 21,495.40/x
  3. Step 3: Cross multiply
    38,991.40x = 58,487.10 × 21,495.40
  4. Step 4: Simplify right side
    38,991.40x = 1,257,203,609.34
  5. Step 5: Solve for x
    x = 1,257,203,609.34/38,991.40
  6. Step 6: Final answer
    x = 32,243.10

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.