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Finding the Fourth Proportional to 15,572.71, 21,490 and 8,499.25

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Solution

The fourth proportional to 15,572.71, 21,490 and 8,499.25 is: 11,728.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,572.71 : 21,490 = 8,499.25 : x
  2. Step 2: Convert to fraction form
    15,572.71/21,490 = 8,499.25/x
  3. Step 3: Cross multiply
    15,572.71x = 21,490 × 8,499.25
  4. Step 4: Simplify right side
    15,572.71x = 182,648,882.50
  5. Step 5: Solve for x
    x = 182,648,882.50/15,572.71
  6. Step 6: Final answer
    x = 11,728.78

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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.