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Finding the Fourth Proportional to 739.92, 1,020.80 and 425.12

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Solution

The fourth proportional to 739.92, 1,020.80 and 425.12 is: 586.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.92 : 1,020.80 = 425.12 : x
  2. Step 2: Convert to fraction form
    739.92/1,020.80 = 425.12/x
  3. Step 3: Cross multiply
    739.92x = 1,020.80 × 425.12
  4. Step 4: Simplify right side
    739.92x = 433,962.50
  5. Step 5: Solve for x
    x = 433,962.50/739.92
  6. Step 6: Final answer
    x = 586.50

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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.