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Finding the Fourth Proportional to 2,718.40, 4,079.76 and 987.52

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Solution

The fourth proportional to 2,718.40, 4,079.76 and 987.52 is: 1,482.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,718.40 : 4,079.76 = 987.52 : x
  2. Step 2: Convert to fraction form
    2,718.40/4,079.76 = 987.52/x
  3. Step 3: Cross multiply
    2,718.40x = 4,079.76 × 987.52
  4. Step 4: Simplify right side
    2,718.40x = 4,028,844.60
  5. Step 5: Solve for x
    x = 4,028,844.60/2,718.40
  6. Step 6: Final answer
    x = 1,482.06

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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.