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Finding the Fourth Proportional to 960.04, 1,438.58 and 439.72

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Solution

The fourth proportional to 960.04, 1,438.58 and 439.72 is: 658.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.04 : 1,438.58 = 439.72 : x
  2. Step 2: Convert to fraction form
    960.04/1,438.58 = 439.72/x
  3. Step 3: Cross multiply
    960.04x = 1,438.58 × 439.72
  4. Step 4: Simplify right side
    960.04x = 632,572.40
  5. Step 5: Solve for x
    x = 632,572.40/960.04
  6. Step 6: Final answer
    x = 658.90

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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.