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Finding the Fourth Proportional to 918.35, 1,267.31 and 520.08

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Solution

The fourth proportional to 918.35, 1,267.31 and 520.08 is: 717.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.35 : 1,267.31 = 520.08 : x
  2. Step 2: Convert to fraction form
    918.35/1,267.31 = 520.08/x
  3. Step 3: Cross multiply
    918.35x = 1,267.31 × 520.08
  4. Step 4: Simplify right side
    918.35x = 659,104.74
  5. Step 5: Solve for x
    x = 659,104.74/918.35
  6. Step 6: Final answer
    x = 717.71

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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.