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Finding the Fourth Proportional to 691.61, 954.39 and 381.11

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Solution

The fourth proportional to 691.61, 954.39 and 381.11 is: 525.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.61 : 954.39 = 381.11 : x
  2. Step 2: Convert to fraction form
    691.61/954.39 = 381.11/x
  3. Step 3: Cross multiply
    691.61x = 954.39 × 381.11
  4. Step 4: Simplify right side
    691.61x = 363,722.80
  5. Step 5: Solve for x
    x = 363,722.80/691.61
  6. Step 6: Final answer
    x = 525.91

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1.5x scale

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.