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Finding the Fourth Proportional to 15,687.68, 21,649.20 and 8,613.92

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Solution

The fourth proportional to 15,687.68, 21,649.20 and 8,613.92 is: 11,887.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,687.68 : 21,649.20 = 8,613.92 : x
  2. Step 2: Convert to fraction form
    15,687.68/21,649.20 = 8,613.92/x
  3. Step 3: Cross multiply
    15,687.68x = 21,649.20 × 8,613.92
  4. Step 4: Simplify right side
    15,687.68x = 186,484,476.86
  5. Step 5: Solve for x
    x = 186,484,476.86/15,687.68
  6. Step 6: Final answer
    x = 11,887.32

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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.