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Finding the Fourth Proportional to 908.03, 1,251.62 and 612.78

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Solution

The fourth proportional to 908.03, 1,251.62 and 612.78 is: 844.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.03 : 1,251.62 = 612.78 : x
  2. Step 2: Convert to fraction form
    908.03/1,251.62 = 612.78/x
  3. Step 3: Cross multiply
    908.03x = 1,251.62 × 612.78
  4. Step 4: Simplify right side
    908.03x = 766,964.64
  5. Step 5: Solve for x
    x = 766,964.64/908.03
  6. Step 6: Final answer
    x = 844.65

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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.