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Finding the Fourth Proportional to 910.90, 1,256.97 and 517.84

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Solution

The fourth proportional to 910.90, 1,256.97 and 517.84 is: 714.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.90 : 1,256.97 = 517.84 : x
  2. Step 2: Convert to fraction form
    910.90/1,256.97 = 517.84/x
  3. Step 3: Cross multiply
    910.90x = 1,256.97 × 517.84
  4. Step 4: Simplify right side
    910.90x = 650,909.34
  5. Step 5: Solve for x
    x = 650,909.34/910.90
  6. Step 6: Final answer
    x = 714.58

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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.