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Finding the Fourth Proportional to 959, 1,439.12 and 411.30

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Solution

The fourth proportional to 959, 1,439.12 and 411.30 is: 617.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    959 : 1,439.12 = 411.30 : x
  2. Step 2: Convert to fraction form
    959/1,439.12 = 411.30/x
  3. Step 3: Cross multiply
    959x = 1,439.12 × 411.30
  4. Step 4: Simplify right side
    959x = 591,910.06
  5. Step 5: Solve for x
    x = 591,910.06/959
  6. Step 6: Final answer
    x = 617.22

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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.