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Finding the Fourth Proportional to 708.70, 979.14 and 551.92

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Solution

The fourth proportional to 708.70, 979.14 and 551.92 is: 762.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.70 : 979.14 = 551.92 : x
  2. Step 2: Convert to fraction form
    708.70/979.14 = 551.92/x
  3. Step 3: Cross multiply
    708.70x = 979.14 × 551.92
  4. Step 4: Simplify right side
    708.70x = 540,406.95
  5. Step 5: Solve for x
    x = 540,406.95/708.70
  6. Step 6: Final answer
    x = 762.53

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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.