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Finding the Fourth Proportional to 1,988.83, 2,980.14 and 755.57

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Solution

The fourth proportional to 1,988.83, 2,980.14 and 755.57 is: 1,132.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.83 : 2,980.14 = 755.57 : x
  2. Step 2: Convert to fraction form
    1,988.83/2,980.14 = 755.57/x
  3. Step 3: Cross multiply
    1,988.83x = 2,980.14 × 755.57
  4. Step 4: Simplify right side
    1,988.83x = 2,251,704.38
  5. Step 5: Solve for x
    x = 2,251,704.38/1,988.83
  6. Step 6: Final answer
    x = 1,132.18

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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.