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Finding the Fourth Proportional to 906.85, 1,251.40 and 508.43

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Solution

The fourth proportional to 906.85, 1,251.40 and 508.43 is: 701.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.85 : 1,251.40 = 508.43 : x
  2. Step 2: Convert to fraction form
    906.85/1,251.40 = 508.43/x
  3. Step 3: Cross multiply
    906.85x = 1,251.40 × 508.43
  4. Step 4: Simplify right side
    906.85x = 636,245.07
  5. Step 5: Solve for x
    x = 636,245.07/906.85
  6. Step 6: Final answer
    x = 701.60

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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.