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Finding the Fourth Proportional to 2,631.84, 3,945.30 and 987.18

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Solution

The fourth proportional to 2,631.84, 3,945.30 and 987.18 is: 1,479.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,631.84 : 3,945.30 = 987.18 : x
  2. Step 2: Convert to fraction form
    2,631.84/3,945.30 = 987.18/x
  3. Step 3: Cross multiply
    2,631.84x = 3,945.30 × 987.18
  4. Step 4: Simplify right side
    2,631.84x = 3,894,721.25
  5. Step 5: Solve for x
    x = 3,894,721.25/2,631.84
  6. Step 6: Final answer
    x = 1,479.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.