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Finding the Fourth Proportional to 890.18, 1,228.33 and 517.11

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Solution

The fourth proportional to 890.18, 1,228.33 and 517.11 is: 713.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.18 : 1,228.33 = 517.11 : x
  2. Step 2: Convert to fraction form
    890.18/1,228.33 = 517.11/x
  3. Step 3: Cross multiply
    890.18x = 1,228.33 × 517.11
  4. Step 4: Simplify right side
    890.18x = 635,181.73
  5. Step 5: Solve for x
    x = 635,181.73/890.18
  6. Step 6: Final answer
    x = 713.54

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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.