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Finding the Fourth Proportional to 748.04, 1,123.45 and 687.08

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Solution

The fourth proportional to 748.04, 1,123.45 and 687.08 is: 1,031.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.04 : 1,123.45 = 687.08 : x
  2. Step 2: Convert to fraction form
    748.04/1,123.45 = 687.08/x
  3. Step 3: Cross multiply
    748.04x = 1,123.45 × 687.08
  4. Step 4: Simplify right side
    748.04x = 771,901.12
  5. Step 5: Solve for x
    x = 771,901.12/748.04
  6. Step 6: Final answer
    x = 1,031.91

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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.