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Finding the Fourth Proportional to 702, 972.90 and 691.20

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Solution

The fourth proportional to 702, 972.90 and 691.20 is: 957.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    702 : 972.90 = 691.20 : x
  2. Step 2: Convert to fraction form
    702/972.90 = 691.20/x
  3. Step 3: Cross multiply
    702x = 972.90 × 691.20
  4. Step 4: Simplify right side
    702x = 672,468.48
  5. Step 5: Solve for x
    x = 672,468.48/702
  6. Step 6: Final answer
    x = 957.93

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.