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Finding the Fourth Proportional to 680.73, 1,020.36 and 487.77

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Solution

The fourth proportional to 680.73, 1,020.36 and 487.77 is: 731.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.73 : 1,020.36 = 487.77 : x
  2. Step 2: Convert to fraction form
    680.73/1,020.36 = 487.77/x
  3. Step 3: Cross multiply
    680.73x = 1,020.36 × 487.77
  4. Step 4: Simplify right side
    680.73x = 497,701.00
  5. Step 5: Solve for x
    x = 497,701.00/680.73
  6. Step 6: Final answer
    x = 731.13

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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.