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Finding the Fourth Proportional to 747.20, 1,121.16 and 336.63

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Solution

The fourth proportional to 747.20, 1,121.16 and 336.63 is: 505.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.20 : 1,121.16 = 336.63 : x
  2. Step 2: Convert to fraction form
    747.20/1,121.16 = 336.63/x
  3. Step 3: Cross multiply
    747.20x = 1,121.16 × 336.63
  4. Step 4: Simplify right side
    747.20x = 377,416.09
  5. Step 5: Solve for x
    x = 377,416.09/747.20
  6. Step 6: Final answer
    x = 505.11

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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.