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Finding the Fourth Proportional to 862.17, 1,189.70 and 489.07

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Solution

The fourth proportional to 862.17, 1,189.70 and 489.07 is: 674.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.17 : 1,189.70 = 489.07 : x
  2. Step 2: Convert to fraction form
    862.17/1,189.70 = 489.07/x
  3. Step 3: Cross multiply
    862.17x = 1,189.70 × 489.07
  4. Step 4: Simplify right side
    862.17x = 581,842.99
  5. Step 5: Solve for x
    x = 581,842.99/862.17
  6. Step 6: Final answer
    x = 674.86

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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.