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Finding the Fourth Proportional to 1,987.44, 2,981.43 and 671.57

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Solution

The fourth proportional to 1,987.44, 2,981.43 and 671.57 is: 1,007.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.44 : 2,981.43 = 671.57 : x
  2. Step 2: Convert to fraction form
    1,987.44/2,981.43 = 671.57/x
  3. Step 3: Cross multiply
    1,987.44x = 2,981.43 × 671.57
  4. Step 4: Simplify right side
    1,987.44x = 2,002,235.22
  5. Step 5: Solve for x
    x = 2,002,235.22/1,987.44
  6. Step 6: Final answer
    x = 1,007.45

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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.