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Finding the Fourth Proportional to 1,988.68, 2,981.18 and 755.72

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Solution

The fourth proportional to 1,988.68, 2,981.18 and 755.72 is: 1,132.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.68 : 2,981.18 = 755.72 : x
  2. Step 2: Convert to fraction form
    1,988.68/2,981.18 = 755.72/x
  3. Step 3: Cross multiply
    1,988.68x = 2,981.18 × 755.72
  4. Step 4: Simplify right side
    1,988.68x = 2,252,937.35
  5. Step 5: Solve for x
    x = 2,252,937.35/1,988.68
  6. Step 6: Final answer
    x = 1,132.88

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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.