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Finding the Fourth Proportional to 959.87, 1,439.85 and 411.68

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Solution

The fourth proportional to 959.87, 1,439.85 and 411.68 is: 617.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.87 : 1,439.85 = 411.68 : x
  2. Step 2: Convert to fraction form
    959.87/1,439.85 = 411.68/x
  3. Step 3: Cross multiply
    959.87x = 1,439.85 × 411.68
  4. Step 4: Simplify right side
    959.87x = 592,756.42
  5. Step 5: Solve for x
    x = 592,756.42/959.87
  6. Step 6: Final answer
    x = 617.54

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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.