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Finding the Fourth Proportional to 706.02, 974.26 and 391.20

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Solution

The fourth proportional to 706.02, 974.26 and 391.20 is: 539.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    706.02 : 974.26 = 391.20 : x
  2. Step 2: Convert to fraction form
    706.02/974.26 = 391.20/x
  3. Step 3: Cross multiply
    706.02x = 974.26 × 391.20
  4. Step 4: Simplify right side
    706.02x = 381,123.68
  5. Step 5: Solve for x
    x = 381,123.68/706.02
  6. Step 6: Final answer
    x = 539.82

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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.