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Finding the Fourth Proportional to 754.92, 1,132.80 and 322.40

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Solution

The fourth proportional to 754.92, 1,132.80 and 322.40 is: 483.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.92 : 1,132.80 = 322.40 : x
  2. Step 2: Convert to fraction form
    754.92/1,132.80 = 322.40/x
  3. Step 3: Cross multiply
    754.92x = 1,132.80 × 322.40
  4. Step 4: Simplify right side
    754.92x = 365,214.72
  5. Step 5: Solve for x
    x = 365,214.72/754.92
  6. Step 6: Final answer
    x = 483.78

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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.