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Finding the Fourth Proportional to 2,718.72, 4,077.76 and 987.20

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Solution

The fourth proportional to 2,718.72, 4,077.76 and 987.20 is: 1,480.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,718.72 : 4,077.76 = 987.20 : x
  2. Step 2: Convert to fraction form
    2,718.72/4,077.76 = 987.20/x
  3. Step 3: Cross multiply
    2,718.72x = 4,077.76 × 987.20
  4. Step 4: Simplify right side
    2,718.72x = 4,025,564.67
  5. Step 5: Solve for x
    x = 4,025,564.67/2,718.72
  6. Step 6: Final answer
    x = 1,480.68

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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.