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Finding the Fourth Proportional to 2,718.60, 4,077.90 and 987

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Solution

The fourth proportional to 2,718.60, 4,077.90 and 987 is: 1,480.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,718.60 : 4,077.90 = 987 : x
  2. Step 2: Convert to fraction form
    2,718.60/4,077.90 = 987/x
  3. Step 3: Cross multiply
    2,718.60x = 4,077.90 × 987
  4. Step 4: Simplify right side
    2,718.60x = 4,024,887.30
  5. Step 5: Solve for x
    x = 4,024,887.30/2,718.60
  6. Step 6: Final answer
    x = 1,480.50

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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.