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Finding the Fourth Proportional to 2,631.92, 3,946.85 and 987.57

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Solution

The fourth proportional to 2,631.92, 3,946.85 and 987.57 is: 1,480.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,631.92 : 3,946.85 = 987.57 : x
  2. Step 2: Convert to fraction form
    2,631.92/3,946.85 = 987.57/x
  3. Step 3: Cross multiply
    2,631.92x = 3,946.85 × 987.57
  4. Step 4: Simplify right side
    2,631.92x = 3,897,790.65
  5. Step 5: Solve for x
    x = 3,897,790.65/2,631.92
  6. Step 6: Final answer
    x = 1,480.97

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1.5x scale

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.