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Finding the Fourth Proportional to 479,666, 661,323.72 and 393,306.80

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Solution

The fourth proportional to 479,666, 661,323.72 and 393,306.80 is: 542,258.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    479,666 : 661,323.72 = 393,306.80 : x
  2. Step 2: Convert to fraction form
    479,666/661,323.72 = 393,306.80/x
  3. Step 3: Cross multiply
    479,666x = 661,323.72 × 393,306.80
  4. Step 4: Simplify right side
    479,666x = 260,103,116,077.30
  5. Step 5: Solve for x
    x = 260,103,116,077.30/479,666
  6. Step 6: Final answer
    x = 542,258.81

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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.