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Finding the Fourth Proportional to 918.92, 1,376.76 and 818.48

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Solution

The fourth proportional to 918.92, 1,376.76 and 818.48 is: 1,226.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.92 : 1,376.76 = 818.48 : x
  2. Step 2: Convert to fraction form
    918.92/1,376.76 = 818.48/x
  3. Step 3: Cross multiply
    918.92x = 1,376.76 × 818.48
  4. Step 4: Simplify right side
    918.92x = 1,126,850.52
  5. Step 5: Solve for x
    x = 1,126,850.52/918.92
  6. Step 6: Final answer
    x = 1,226.28

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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.