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Finding the Fourth Proportional to 949.60, 1,423.05 and 660.70

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Solution

The fourth proportional to 949.60, 1,423.05 and 660.70 is: 990.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.60 : 1,423.05 = 660.70 : x
  2. Step 2: Convert to fraction form
    949.60/1,423.05 = 660.70/x
  3. Step 3: Cross multiply
    949.60x = 1,423.05 × 660.70
  4. Step 4: Simplify right side
    949.60x = 940,209.14
  5. Step 5: Solve for x
    x = 940,209.14/949.60
  6. Step 6: Final answer
    x = 990.11

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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.