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Finding the Fourth Proportional to 747.55, 1,121.38 and 336.72

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Solution

The fourth proportional to 747.55, 1,121.38 and 336.72 is: 505.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.55 : 1,121.38 = 336.72 : x
  2. Step 2: Convert to fraction form
    747.55/1,121.38 = 336.72/x
  3. Step 3: Cross multiply
    747.55x = 1,121.38 × 336.72
  4. Step 4: Simplify right side
    747.55x = 377,591.07
  5. Step 5: Solve for x
    x = 377,591.07/747.55
  6. Step 6: Final answer
    x = 505.10

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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.