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Finding the Fourth Proportional to 747.08, 1,119.72 and 421.78

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Solution

The fourth proportional to 747.08, 1,119.72 and 421.78 is: 632.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.08 : 1,119.72 = 421.78 : x
  2. Step 2: Convert to fraction form
    747.08/1,119.72 = 421.78/x
  3. Step 3: Cross multiply
    747.08x = 1,119.72 × 421.78
  4. Step 4: Simplify right side
    747.08x = 472,275.50
  5. Step 5: Solve for x
    x = 472,275.50/747.08
  6. Step 6: Final answer
    x = 632.16

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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.