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Finding the Fourth Proportional to 691.30, 953.79 and 411.31

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Solution

The fourth proportional to 691.30, 953.79 and 411.31 is: 567.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.30 : 953.79 = 411.31 : x
  2. Step 2: Convert to fraction form
    691.30/953.79 = 411.31/x
  3. Step 3: Cross multiply
    691.30x = 953.79 × 411.31
  4. Step 4: Simplify right side
    691.30x = 392,303.36
  5. Step 5: Solve for x
    x = 392,303.36/691.30
  6. Step 6: Final answer
    x = 567.49

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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.