Home / 15,715.45-21,687.32-8,641.87

Finding the Fourth Proportional to 15,715.45, 21,687.32 and 8,641.87

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Solution

The fourth proportional to 15,715.45, 21,687.32 and 8,641.87 is: 11,925.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,715.45 : 21,687.32 = 8,641.87 : x
  2. Step 2: Convert to fraction form
    15,715.45/21,687.32 = 8,641.87/x
  3. Step 3: Cross multiply
    15,715.45x = 21,687.32 × 8,641.87
  4. Step 4: Simplify right side
    15,715.45x = 187,418,967.47
  5. Step 5: Solve for x
    x = 187,418,967.47/15,715.45
  6. Step 6: Final answer
    x = 11,925.78

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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.