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Finding the Fourth Proportional to 691.64, 954.52 and 396.86

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Solution

The fourth proportional to 691.64, 954.52 and 396.86 is: 547.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.64 : 954.52 = 396.86 : x
  2. Step 2: Convert to fraction form
    691.64/954.52 = 396.86/x
  3. Step 3: Cross multiply
    691.64x = 954.52 × 396.86
  4. Step 4: Simplify right side
    691.64x = 378,810.81
  5. Step 5: Solve for x
    x = 378,810.81/691.64
  6. Step 6: Final answer
    x = 547.70

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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.