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Finding the Fourth Proportional to 21,640.76, 29,864.22 and 11,704.76

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Solution

The fourth proportional to 21,640.76, 29,864.22 and 11,704.76 is: 16,152.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,640.76 : 29,864.22 = 11,704.76 : x
  2. Step 2: Convert to fraction form
    21,640.76/29,864.22 = 11,704.76/x
  3. Step 3: Cross multiply
    21,640.76x = 29,864.22 × 11,704.76
  4. Step 4: Simplify right side
    21,640.76x = 349,553,527.69
  5. Step 5: Solve for x
    x = 349,553,527.69/21,640.76
  6. Step 6: Final answer
    x = 16,152.55

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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.