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Finding the Fourth Proportional to 2,630.86, 3,946.14 and 987.27

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Solution

The fourth proportional to 2,630.86, 3,946.14 and 987.27 is: 1,480.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,630.86 : 3,946.14 = 987.27 : x
  2. Step 2: Convert to fraction form
    2,630.86/3,946.14 = 987.27/x
  3. Step 3: Cross multiply
    2,630.86x = 3,946.14 × 987.27
  4. Step 4: Simplify right side
    2,630.86x = 3,895,905.64
  5. Step 5: Solve for x
    x = 3,895,905.64/2,630.86
  6. Step 6: Final answer
    x = 1,480.85

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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.