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Finding the Fourth Proportional to 918.55, 1,267.66 and 520.21

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Solution

The fourth proportional to 918.55, 1,267.66 and 520.21 is: 717.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.55 : 1,267.66 = 520.21 : x
  2. Step 2: Convert to fraction form
    918.55/1,267.66 = 520.21/x
  3. Step 3: Cross multiply
    918.55x = 1,267.66 × 520.21
  4. Step 4: Simplify right side
    918.55x = 659,449.54
  5. Step 5: Solve for x
    x = 659,449.54/918.55
  6. Step 6: Final answer
    x = 717.92

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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.