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Finding the Fourth Proportional to 874.13, 1,311.53 and 411.89

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Solution

The fourth proportional to 874.13, 1,311.53 and 411.89 is: 617.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.13 : 1,311.53 = 411.89 : x
  2. Step 2: Convert to fraction form
    874.13/1,311.53 = 411.89/x
  3. Step 3: Cross multiply
    874.13x = 1,311.53 × 411.89
  4. Step 4: Simplify right side
    874.13x = 540,197.47
  5. Step 5: Solve for x
    x = 540,197.47/874.13
  6. Step 6: Final answer
    x = 617.99

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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.