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Finding the Fourth Proportional to 1,987.71, 2,980.79 and 671.10

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Solution

The fourth proportional to 1,987.71, 2,980.79 and 671.10 is: 1,006.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.71 : 2,980.79 = 671.10 : x
  2. Step 2: Convert to fraction form
    1,987.71/2,980.79 = 671.10/x
  3. Step 3: Cross multiply
    1,987.71x = 2,980.79 × 671.10
  4. Step 4: Simplify right side
    1,987.71x = 2,000,408.17
  5. Step 5: Solve for x
    x = 2,000,408.17/1,987.71
  6. Step 6: Final answer
    x = 1,006.39

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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.