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Finding the Fourth Proportional to 691.13, 953.78 and 411.58

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Solution

The fourth proportional to 691.13, 953.78 and 411.58 is: 567.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.13 : 953.78 = 411.58 : x
  2. Step 2: Convert to fraction form
    691.13/953.78 = 411.58/x
  3. Step 3: Cross multiply
    691.13x = 953.78 × 411.58
  4. Step 4: Simplify right side
    691.13x = 392,555.91
  5. Step 5: Solve for x
    x = 392,555.91/691.13
  6. Step 6: Final answer
    x = 567.99

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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.