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Finding the Fourth Proportional to 918.92, 1,379.28 and 480.60

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Solution

The fourth proportional to 918.92, 1,379.28 and 480.60 is: 721.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.92 : 1,379.28 = 480.60 : x
  2. Step 2: Convert to fraction form
    918.92/1,379.28 = 480.60/x
  3. Step 3: Cross multiply
    918.92x = 1,379.28 × 480.60
  4. Step 4: Simplify right side
    918.92x = 662,881.97
  5. Step 5: Solve for x
    x = 662,881.97/918.92
  6. Step 6: Final answer
    x = 721.37

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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.