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Finding the Fourth Proportional to 688.47, 1,032.70 and 489.97

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Solution

The fourth proportional to 688.47, 1,032.70 and 489.97 is: 734.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.47 : 1,032.70 = 489.97 : x
  2. Step 2: Convert to fraction form
    688.47/1,032.70 = 489.97/x
  3. Step 3: Cross multiply
    688.47x = 1,032.70 × 489.97
  4. Step 4: Simplify right side
    688.47x = 505,992.02
  5. Step 5: Solve for x
    x = 505,992.02/688.47
  6. Step 6: Final answer
    x = 734.95

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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.