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Finding the Fourth Proportional to 918.24, 1,267.92 and 624.48

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Solution

The fourth proportional to 918.24, 1,267.92 and 624.48 is: 862.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.24 : 1,267.92 = 624.48 : x
  2. Step 2: Convert to fraction form
    918.24/1,267.92 = 624.48/x
  3. Step 3: Cross multiply
    918.24x = 1,267.92 × 624.48
  4. Step 4: Simplify right side
    918.24x = 791,790.68
  5. Step 5: Solve for x
    x = 791,790.68/918.24
  6. Step 6: Final answer
    x = 862.29

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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.