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Finding the Fourth Proportional to 2,439.32, 3,658.87 and 660.45

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Solution

The fourth proportional to 2,439.32, 3,658.87 and 660.45 is: 990.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,439.32 : 3,658.87 = 660.45 : x
  2. Step 2: Convert to fraction form
    2,439.32/3,658.87 = 660.45/x
  3. Step 3: Cross multiply
    2,439.32x = 3,658.87 × 660.45
  4. Step 4: Simplify right side
    2,439.32x = 2,416,499.04
  5. Step 5: Solve for x
    x = 2,416,499.04/2,439.32
  6. Step 6: Final answer
    x = 990.64

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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.