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Finding the Fourth Proportional to 747.93, 1,120.36 and 438.85

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Solution

The fourth proportional to 747.93, 1,120.36 and 438.85 is: 657.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.93 : 1,120.36 = 438.85 : x
  2. Step 2: Convert to fraction form
    747.93/1,120.36 = 438.85/x
  3. Step 3: Cross multiply
    747.93x = 1,120.36 × 438.85
  4. Step 4: Simplify right side
    747.93x = 491,669.99
  5. Step 5: Solve for x
    x = 491,669.99/747.93
  6. Step 6: Final answer
    x = 657.37

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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.