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Finding the Fourth Proportional to 661,640.80, 992,461.20 and 381,704.80

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Solution

The fourth proportional to 661,640.80, 992,461.20 and 381,704.80 is: 572,557.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,640.80 : 992,461.20 = 381,704.80 : x
  2. Step 2: Convert to fraction form
    661,640.80/992,461.20 = 381,704.80/x
  3. Step 3: Cross multiply
    661,640.80x = 992,461.20 × 381,704.80
  4. Step 4: Simplify right side
    661,640.80x = 378,827,203,853.76
  5. Step 5: Solve for x
    x = 378,827,203,853.76/661,640.80
  6. Step 6: Final answer
    x = 572,557.20

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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.