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Finding the Fourth Proportional to 2,630.78, 3,946.26 and 987.02

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Solution

The fourth proportional to 2,630.78, 3,946.26 and 987.02 is: 1,480.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,630.78 : 3,946.26 = 987.02 : x
  2. Step 2: Convert to fraction form
    2,630.78/3,946.26 = 987.02/x
  3. Step 3: Cross multiply
    2,630.78x = 3,946.26 × 987.02
  4. Step 4: Simplify right side
    2,630.78x = 3,895,037.55
  5. Step 5: Solve for x
    x = 3,895,037.55/2,630.78
  6. Step 6: Final answer
    x = 1,480.56

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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.