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Finding the Fourth Proportional to 1,987.24, 2,980.94 and 671.02

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Solution

The fourth proportional to 1,987.24, 2,980.94 and 671.02 is: 1,006.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.24 : 2,980.94 = 671.02 : x
  2. Step 2: Convert to fraction form
    1,987.24/2,980.94 = 671.02/x
  3. Step 3: Cross multiply
    1,987.24x = 2,980.94 × 671.02
  4. Step 4: Simplify right side
    1,987.24x = 2,000,262.07
  5. Step 5: Solve for x
    x = 2,000,262.07/1,987.24
  6. Step 6: Final answer
    x = 1,006.55

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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.