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Finding the Fourth Proportional to 747.12, 1,120.24 and 314.16

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Solution

The fourth proportional to 747.12, 1,120.24 and 314.16 is: 471.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.12 : 1,120.24 = 314.16 : x
  2. Step 2: Convert to fraction form
    747.12/1,120.24 = 314.16/x
  3. Step 3: Cross multiply
    747.12x = 1,120.24 × 314.16
  4. Step 4: Simplify right side
    747.12x = 351,934.60
  5. Step 5: Solve for x
    x = 351,934.60/747.12
  6. Step 6: Final answer
    x = 471.05

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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.