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Finding the Fourth Proportional to 292,491.65, 438,764.25 and 82,128.17

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Solution

The fourth proportional to 292,491.65, 438,764.25 and 82,128.17 is: 123,199.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    292,491.65 : 438,764.25 = 82,128.17 : x
  2. Step 2: Convert to fraction form
    292,491.65/438,764.25 = 82,128.17/x
  3. Step 3: Cross multiply
    292,491.65x = 438,764.25 × 82,128.17
  4. Step 4: Simplify right side
    292,491.65x = 36,034,906,318.81
  5. Step 5: Solve for x
    x = 36,034,906,318.81/292,491.65
  6. Step 6: Final answer
    x = 123,199.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.