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Finding the Fourth Proportional to 15,718.65, 21,691.31 and 8,645.08

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Solution

The fourth proportional to 15,718.65, 21,691.31 and 8,645.08 is: 11,929.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,718.65 : 21,691.31 = 8,645.08 : x
  2. Step 2: Convert to fraction form
    15,718.65/21,691.31 = 8,645.08/x
  3. Step 3: Cross multiply
    15,718.65x = 21,691.31 × 8,645.08
  4. Step 4: Simplify right side
    15,718.65x = 187,523,110.25
  5. Step 5: Solve for x
    x = 187,523,110.25/15,718.65
  6. Step 6: Final answer
    x = 11,929.98

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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.