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Finding the Fourth Proportional to 866.90, 1,196.58 and 517.80

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Solution

The fourth proportional to 866.90, 1,196.58 and 517.80 is: 714.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.90 : 1,196.58 = 517.80 : x
  2. Step 2: Convert to fraction form
    866.90/1,196.58 = 517.80/x
  3. Step 3: Cross multiply
    866.90x = 1,196.58 × 517.80
  4. Step 4: Simplify right side
    866.90x = 619,589.12
  5. Step 5: Solve for x
    x = 619,589.12/866.90
  6. Step 6: Final answer
    x = 714.72

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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.