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Finding the Fourth Proportional to 959.47, 1,439.04 and 439.35

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Solution

The fourth proportional to 959.47, 1,439.04 and 439.35 is: 658.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.47 : 1,439.04 = 439.35 : x
  2. Step 2: Convert to fraction form
    959.47/1,439.04 = 439.35/x
  3. Step 3: Cross multiply
    959.47x = 1,439.04 × 439.35
  4. Step 4: Simplify right side
    959.47x = 632,238.48
  5. Step 5: Solve for x
    x = 632,238.48/959.47
  6. Step 6: Final answer
    x = 658.95

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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.