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Finding the Fourth Proportional to 1,718.88, 2,578.48 and 987.04

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Solution

The fourth proportional to 1,718.88, 2,578.48 and 987.04 is: 1,480.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,718.88 : 2,578.48 = 987.04 : x
  2. Step 2: Convert to fraction form
    1,718.88/2,578.48 = 987.04/x
  3. Step 3: Cross multiply
    1,718.88x = 2,578.48 × 987.04
  4. Step 4: Simplify right side
    1,718.88x = 2,545,062.90
  5. Step 5: Solve for x
    x = 2,545,062.90/1,718.88
  6. Step 6: Final answer
    x = 1,480.65

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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.