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Finding the Fourth Proportional to 910.85, 1,257.09 and 517.79

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Solution

The fourth proportional to 910.85, 1,257.09 and 517.79 is: 714.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.85 : 1,257.09 = 517.79 : x
  2. Step 2: Convert to fraction form
    910.85/1,257.09 = 517.79/x
  3. Step 3: Cross multiply
    910.85x = 1,257.09 × 517.79
  4. Step 4: Simplify right side
    910.85x = 650,909.83
  5. Step 5: Solve for x
    x = 650,909.83/910.85
  6. Step 6: Final answer
    x = 714.62

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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.