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Finding the Fourth Proportional to 749.80, 1,123.35 and 663.40

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Solution

The fourth proportional to 749.80, 1,123.35 and 663.40 is: 993.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.80 : 1,123.35 = 663.40 : x
  2. Step 2: Convert to fraction form
    749.80/1,123.35 = 663.40/x
  3. Step 3: Cross multiply
    749.80x = 1,123.35 × 663.40
  4. Step 4: Simplify right side
    749.80x = 745,230.39
  5. Step 5: Solve for x
    x = 745,230.39/749.80
  6. Step 6: Final answer
    x = 993.91

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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.