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Finding the Fourth Proportional to 890.90, 1,229.50 and 517.89

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Solution

The fourth proportional to 890.90, 1,229.50 and 517.89 is: 714.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.90 : 1,229.50 = 517.89 : x
  2. Step 2: Convert to fraction form
    890.90/1,229.50 = 517.89/x
  3. Step 3: Cross multiply
    890.90x = 1,229.50 × 517.89
  4. Step 4: Simplify right side
    890.90x = 636,745.76
  5. Step 5: Solve for x
    x = 636,745.76/890.90
  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.