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Finding the Fourth Proportional to 754.78, 1,040.85 and 502.30

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Solution

The fourth proportional to 754.78, 1,040.85 and 502.30 is: 692.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.78 : 1,040.85 = 502.30 : x
  2. Step 2: Convert to fraction form
    754.78/1,040.85 = 502.30/x
  3. Step 3: Cross multiply
    754.78x = 1,040.85 × 502.30
  4. Step 4: Simplify right side
    754.78x = 522,818.96
  5. Step 5: Solve for x
    x = 522,818.96/754.78
  6. Step 6: Final answer
    x = 692.68

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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.