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Finding the Fourth Proportional to 882.81, 1,218.38 and 489.87

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Solution

The fourth proportional to 882.81, 1,218.38 and 489.87 is: 676.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    882.81 : 1,218.38 = 489.87 : x
  2. Step 2: Convert to fraction form
    882.81/1,218.38 = 489.87/x
  3. Step 3: Cross multiply
    882.81x = 1,218.38 × 489.87
  4. Step 4: Simplify right side
    882.81x = 596,845.36
  5. Step 5: Solve for x
    x = 596,845.36/882.81
  6. Step 6: Final answer
    x = 676.07

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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.