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Finding the Fourth Proportional to 959.70, 1,439.10 and 411.60

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Solution

The fourth proportional to 959.70, 1,439.10 and 411.60 is: 617.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.70 : 1,439.10 = 411.60 : x
  2. Step 2: Convert to fraction form
    959.70/1,439.10 = 411.60/x
  3. Step 3: Cross multiply
    959.70x = 1,439.10 × 411.60
  4. Step 4: Simplify right side
    959.70x = 592,333.56
  5. Step 5: Solve for x
    x = 592,333.56/959.70
  6. Step 6: Final answer
    x = 617.21

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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.