Home / 15,715.42-21,687.14-8,641.69

Finding the Fourth Proportional to 15,715.42, 21,687.14 and 8,641.69

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Solution

The fourth proportional to 15,715.42, 21,687.14 and 8,641.69 is: 11,925.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,715.42 : 21,687.14 = 8,641.69 : x
  2. Step 2: Convert to fraction form
    15,715.42/21,687.14 = 8,641.69/x
  3. Step 3: Cross multiply
    15,715.42x = 21,687.14 × 8,641.69
  4. Step 4: Simplify right side
    15,715.42x = 187,413,508.25
  5. Step 5: Solve for x
    x = 187,413,508.25/15,715.42
  6. Step 6: Final answer
    x = 11,925.46

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Half scale
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Double scale
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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.