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Finding the Fourth Proportional to 753.68, 1,130.56 and 321.20

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Solution

The fourth proportional to 753.68, 1,130.56 and 321.20 is: 481.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.68 : 1,130.56 = 321.20 : x
  2. Step 2: Convert to fraction form
    753.68/1,130.56 = 321.20/x
  3. Step 3: Cross multiply
    753.68x = 1,130.56 × 321.20
  4. Step 4: Simplify right side
    753.68x = 363,135.87
  5. Step 5: Solve for x
    x = 363,135.87/753.68
  6. Step 6: Final answer
    x = 481.82

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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.