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Finding the Fourth Proportional to 691.62, 955.10 and 591.45

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Solution

The fourth proportional to 691.62, 955.10 and 591.45 is: 816.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.62 : 955.10 = 591.45 : x
  2. Step 2: Convert to fraction form
    691.62/955.10 = 591.45/x
  3. Step 3: Cross multiply
    691.62x = 955.10 × 591.45
  4. Step 4: Simplify right side
    691.62x = 564,891.79
  5. Step 5: Solve for x
    x = 564,891.79/691.62
  6. Step 6: Final answer
    x = 816.77

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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.