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Finding the Fourth Proportional to 1,987.71, 2,981.13 and 817.43

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Solution

The fourth proportional to 1,987.71, 2,981.13 and 817.43 is: 1,225.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.71 : 2,981.13 = 817.43 : x
  2. Step 2: Convert to fraction form
    1,987.71/2,981.13 = 817.43/x
  3. Step 3: Cross multiply
    1,987.71x = 2,981.13 × 817.43
  4. Step 4: Simplify right side
    1,987.71x = 2,436,850.19
  5. Step 5: Solve for x
    x = 2,436,850.19/1,987.71
  6. Step 6: Final answer
    x = 1,225.96

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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.