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Finding the Fourth Proportional to 15,353.01, 21,187.06 and 8,638.69

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Solution

The fourth proportional to 15,353.01, 21,187.06 and 8,638.69 is: 11,921.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,353.01 : 21,187.06 = 8,638.69 : x
  2. Step 2: Convert to fraction form
    15,353.01/21,187.06 = 8,638.69/x
  3. Step 3: Cross multiply
    15,353.01x = 21,187.06 × 8,638.69
  4. Step 4: Simplify right side
    15,353.01x = 183,028,366.57
  5. Step 5: Solve for x
    x = 183,028,366.57/15,353.01
  6. Step 6: Final answer
    x = 11,921.34

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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.