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Finding the Fourth Proportional to 925.39, 1,276.99 and 505.72

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Solution

The fourth proportional to 925.39, 1,276.99 and 505.72 is: 697.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.39 : 1,276.99 = 505.72 : x
  2. Step 2: Convert to fraction form
    925.39/1,276.99 = 505.72/x
  3. Step 3: Cross multiply
    925.39x = 1,276.99 × 505.72
  4. Step 4: Simplify right side
    925.39x = 645,799.38
  5. Step 5: Solve for x
    x = 645,799.38/925.39
  6. Step 6: Final answer
    x = 697.87

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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.