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Finding the Fourth Proportional to 908.10, 1,359.45 and 854.70

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Solution

The fourth proportional to 908.10, 1,359.45 and 854.70 is: 1,279.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.10 : 1,359.45 = 854.70 : x
  2. Step 2: Convert to fraction form
    908.10/1,359.45 = 854.70/x
  3. Step 3: Cross multiply
    908.10x = 1,359.45 × 854.70
  4. Step 4: Simplify right side
    908.10x = 1,161,921.92
  5. Step 5: Solve for x
    x = 1,161,921.92/908.10
  6. Step 6: Final answer
    x = 1,279.51

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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.