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Finding the Fourth Proportional to 747.32, 1,121.00 and 278.91

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Solution

The fourth proportional to 747.32, 1,121.00 and 278.91 is: 418.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.32 : 1,121.00 = 278.91 : x
  2. Step 2: Convert to fraction form
    747.32/1,121.00 = 278.91/x
  3. Step 3: Cross multiply
    747.32x = 1,121.00 × 278.91
  4. Step 4: Simplify right side
    747.32x = 312,656.72
  5. Step 5: Solve for x
    x = 312,656.72/747.32
  6. Step 6: Final answer
    x = 418.37

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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.