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Finding the Fourth Proportional to 749.40, 1,123.20 and 556.80

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Solution

The fourth proportional to 749.40, 1,123.20 and 556.80 is: 834.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.40 : 1,123.20 = 556.80 : x
  2. Step 2: Convert to fraction form
    749.40/1,123.20 = 556.80/x
  3. Step 3: Cross multiply
    749.40x = 1,123.20 × 556.80
  4. Step 4: Simplify right side
    749.40x = 625,397.76
  5. Step 5: Solve for x
    x = 625,397.76/749.40
  6. Step 6: Final answer
    x = 834.53

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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.