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Finding the Fourth Proportional to 710.74, 979.88 and 489.30

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Solution

The fourth proportional to 710.74, 979.88 and 489.30 is: 674.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.74 : 979.88 = 489.30 : x
  2. Step 2: Convert to fraction form
    710.74/979.88 = 489.30/x
  3. Step 3: Cross multiply
    710.74x = 979.88 × 489.30
  4. Step 4: Simplify right side
    710.74x = 479,455.28
  5. Step 5: Solve for x
    x = 479,455.28/710.74
  6. Step 6: Final answer
    x = 674.59

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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.