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Finding the Fourth Proportional to 867.90, 1,197.72 and 489.76

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Solution

The fourth proportional to 867.90, 1,197.72 and 489.76 is: 675.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.90 : 1,197.72 = 489.76 : x
  2. Step 2: Convert to fraction form
    867.90/1,197.72 = 489.76/x
  3. Step 3: Cross multiply
    867.90x = 1,197.72 × 489.76
  4. Step 4: Simplify right side
    867.90x = 586,595.35
  5. Step 5: Solve for x
    x = 586,595.35/867.90
  6. Step 6: Final answer
    x = 675.88

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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.