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Finding the Fourth Proportional to 908.90, 1,254.28 and 515.96

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Solution

The fourth proportional to 908.90, 1,254.28 and 515.96 is: 712.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.90 : 1,254.28 = 515.96 : x
  2. Step 2: Convert to fraction form
    908.90/1,254.28 = 515.96/x
  3. Step 3: Cross multiply
    908.90x = 1,254.28 × 515.96
  4. Step 4: Simplify right side
    908.90x = 647,158.31
  5. Step 5: Solve for x
    x = 647,158.31/908.90
  6. Step 6: Final answer
    x = 712.02

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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.