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Finding the Fourth Proportional to 959.61, 1,439.15 and 411.66

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Solution

The fourth proportional to 959.61, 1,439.15 and 411.66 is: 617.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.61 : 1,439.15 = 411.66 : x
  2. Step 2: Convert to fraction form
    959.61/1,439.15 = 411.66/x
  3. Step 3: Cross multiply
    959.61x = 1,439.15 × 411.66
  4. Step 4: Simplify right side
    959.61x = 592,438.43
  5. Step 5: Solve for x
    x = 592,438.43/959.61
  6. Step 6: Final answer
    x = 617.38

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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.