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Finding the Fourth Proportional to 393,042.76, 542,332.72 and 220,938

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Solution

The fourth proportional to 393,042.76, 542,332.72 and 220,938 is: 304,857.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,042.76 : 542,332.72 = 220,938 : x
  2. Step 2: Convert to fraction form
    393,042.76/542,332.72 = 220,938/x
  3. Step 3: Cross multiply
    393,042.76x = 542,332.72 × 220,938
  4. Step 4: Simplify right side
    393,042.76x = 119,821,906,491.36
  5. Step 5: Solve for x
    x = 119,821,906,491.36/393,042.76
  6. Step 6: Final answer
    x = 304,857.18

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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.