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Finding the Fourth Proportional to 918.20, 1,267.16 and 519.90

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Solution

The fourth proportional to 918.20, 1,267.16 and 519.90 is: 717.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.20 : 1,267.16 = 519.90 : x
  2. Step 2: Convert to fraction form
    918.20/1,267.16 = 519.90/x
  3. Step 3: Cross multiply
    918.20x = 1,267.16 × 519.90
  4. Step 4: Simplify right side
    918.20x = 658,793.88
  5. Step 5: Solve for x
    x = 658,793.88/918.20
  6. Step 6: Final answer
    x = 717.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.