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Finding the Fourth Proportional to 691.85, 954.77 and 397.10

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Solution

The fourth proportional to 691.85, 954.77 and 397.10 is: 548.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.85 : 954.77 = 397.10 : x
  2. Step 2: Convert to fraction form
    691.85/954.77 = 397.10/x
  3. Step 3: Cross multiply
    691.85x = 954.77 × 397.10
  4. Step 4: Simplify right side
    691.85x = 379,139.17
  5. Step 5: Solve for x
    x = 379,139.17/691.85
  6. Step 6: Final answer
    x = 548.01

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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.