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Finding the Fourth Proportional to 748.13, 1,031.40 and 548.80

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Solution

The fourth proportional to 748.13, 1,031.40 and 548.80 is: 756.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.13 : 1,031.40 = 548.80 : x
  2. Step 2: Convert to fraction form
    748.13/1,031.40 = 548.80/x
  3. Step 3: Cross multiply
    748.13x = 1,031.40 × 548.80
  4. Step 4: Simplify right side
    748.13x = 566,029.74
  5. Step 5: Solve for x
    x = 566,029.74/748.13
  6. Step 6: Final answer
    x = 756.60

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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.