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Finding the Fourth Proportional to 959.64, 1,439.71 and 439.39

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Solution

The fourth proportional to 959.64, 1,439.71 and 439.39 is: 659.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.64 : 1,439.71 = 439.39 : x
  2. Step 2: Convert to fraction form
    959.64/1,439.71 = 439.39/x
  3. Step 3: Cross multiply
    959.64x = 1,439.71 × 439.39
  4. Step 4: Simplify right side
    959.64x = 632,594.18
  5. Step 5: Solve for x
    x = 632,594.18/959.64
  6. Step 6: Final answer
    x = 659.20

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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.