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Finding the Fourth Proportional to 754.67, 1,129.46 and 539.65

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Solution

The fourth proportional to 754.67, 1,129.46 and 539.65 is: 807.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.67 : 1,129.46 = 539.65 : x
  2. Step 2: Convert to fraction form
    754.67/1,129.46 = 539.65/x
  3. Step 3: Cross multiply
    754.67x = 1,129.46 × 539.65
  4. Step 4: Simplify right side
    754.67x = 609,504.74
  5. Step 5: Solve for x
    x = 609,504.74/754.67
  6. Step 6: Final answer
    x = 807.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.