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Finding the Fourth Proportional to 959.28, 1,438.80 and 439.13

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Solution

The fourth proportional to 959.28, 1,438.80 and 439.13 is: 658.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.28 : 1,438.80 = 439.13 : x
  2. Step 2: Convert to fraction form
    959.28/1,438.80 = 439.13/x
  3. Step 3: Cross multiply
    959.28x = 1,438.80 × 439.13
  4. Step 4: Simplify right side
    959.28x = 631,818.05
  5. Step 5: Solve for x
    x = 631,818.05/959.28
  6. Step 6: Final answer
    x = 658.64

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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.