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Finding the Fourth Proportional to 918.40, 1,377.60 and 908.80

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Solution

The fourth proportional to 918.40, 1,377.60 and 908.80 is: 1,363.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.40 : 1,377.60 = 908.80 : x
  2. Step 2: Convert to fraction form
    918.40/1,377.60 = 908.80/x
  3. Step 3: Cross multiply
    918.40x = 1,377.60 × 908.80
  4. Step 4: Simplify right side
    918.40x = 1,251,962.88
  5. Step 5: Solve for x
    x = 1,251,962.88/918.40
  6. Step 6: Final answer
    x = 1,363.20

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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.