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Finding the Fourth Proportional to 925.30, 1,276.91 and 505.64

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Solution

The fourth proportional to 925.30, 1,276.91 and 505.64 is: 697.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.30 : 1,276.91 = 505.64 : x
  2. Step 2: Convert to fraction form
    925.30/1,276.91 = 505.64/x
  3. Step 3: Cross multiply
    925.30x = 1,276.91 × 505.64
  4. Step 4: Simplify right side
    925.30x = 645,660.04
  5. Step 5: Solve for x
    x = 645,660.04/925.30
  6. Step 6: Final answer
    x = 697.78

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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.