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Finding the Fourth Proportional to 754.38, 1,040.74 and 505.86

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Solution

The fourth proportional to 754.38, 1,040.74 and 505.86 is: 697.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.38 : 1,040.74 = 505.86 : x
  2. Step 2: Convert to fraction form
    754.38/1,040.74 = 505.86/x
  3. Step 3: Cross multiply
    754.38x = 1,040.74 × 505.86
  4. Step 4: Simplify right side
    754.38x = 526,468.74
  5. Step 5: Solve for x
    x = 526,468.74/754.38
  6. Step 6: Final answer
    x = 697.88

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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.