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Finding the Fourth Proportional to 908.85, 1,254.20 and 494.85

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Solution

The fourth proportional to 908.85, 1,254.20 and 494.85 is: 682.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.85 : 1,254.20 = 494.85 : x
  2. Step 2: Convert to fraction form
    908.85/1,254.20 = 494.85/x
  3. Step 3: Cross multiply
    908.85x = 1,254.20 × 494.85
  4. Step 4: Simplify right side
    908.85x = 620,640.87
  5. Step 5: Solve for x
    x = 620,640.87/908.85
  6. Step 6: Final answer
    x = 682.89

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1.5x scale

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.