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Finding the Fourth Proportional to 21,995.96, 30,354.76 and 12,564.56

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Solution

The fourth proportional to 21,995.96, 30,354.76 and 12,564.56 is: 17,339.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,995.96 : 30,354.76 = 12,564.56 : x
  2. Step 2: Convert to fraction form
    21,995.96/30,354.76 = 12,564.56/x
  3. Step 3: Cross multiply
    21,995.96x = 30,354.76 × 12,564.56
  4. Step 4: Simplify right side
    21,995.96x = 381,394,203.31
  5. Step 5: Solve for x
    x = 381,394,203.31/21,995.96
  6. Step 6: Final answer
    x = 17,339.28

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.