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Finding the Fourth Proportional to 748.22, 1,031.85 and 539.78

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Solution

The fourth proportional to 748.22, 1,031.85 and 539.78 is: 744.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.22 : 1,031.85 = 539.78 : x
  2. Step 2: Convert to fraction form
    748.22/1,031.85 = 539.78/x
  3. Step 3: Cross multiply
    748.22x = 1,031.85 × 539.78
  4. Step 4: Simplify right side
    748.22x = 556,966.83
  5. Step 5: Solve for x
    x = 556,966.83/748.22
  6. Step 6: Final answer
    x = 744.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.