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Finding the Fourth Proportional to 15,645.68, 21,598.02 and 9,987.92

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Solution

The fourth proportional to 15,645.68, 21,598.02 and 9,987.92 is: 13,787.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,645.68 : 21,598.02 = 9,987.92 : x
  2. Step 2: Convert to fraction form
    15,645.68/21,598.02 = 9,987.92/x
  3. Step 3: Cross multiply
    15,645.68x = 21,598.02 × 9,987.92
  4. Step 4: Simplify right side
    15,645.68x = 215,719,187.93
  5. Step 5: Solve for x
    x = 215,719,187.93/15,645.68
  6. Step 6: Final answer
    x = 13,787.78

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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.