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Finding the Fourth Proportional to 882.79, 1,218.21 and 489.81

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Solution

The fourth proportional to 882.79, 1,218.21 and 489.81 is: 675.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    882.79 : 1,218.21 = 489.81 : x
  2. Step 2: Convert to fraction form
    882.79/1,218.21 = 489.81/x
  3. Step 3: Cross multiply
    882.79x = 1,218.21 × 489.81
  4. Step 4: Simplify right side
    882.79x = 596,691.44
  5. Step 5: Solve for x
    x = 596,691.44/882.79
  6. Step 6: Final answer
    x = 675.92

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1.5x scale

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.