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Finding the Fourth Proportional to 753.03, 1,123.56 and 660.69

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Solution

The fourth proportional to 753.03, 1,123.56 and 660.69 is: 985.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.03 : 1,123.56 = 660.69 : x
  2. Step 2: Convert to fraction form
    753.03/1,123.56 = 660.69/x
  3. Step 3: Cross multiply
    753.03x = 1,123.56 × 660.69
  4. Step 4: Simplify right side
    753.03x = 742,324.86
  5. Step 5: Solve for x
    x = 742,324.86/753.03
  6. Step 6: Final answer
    x = 985.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.