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Finding the Fourth Proportional to 2,083.88, 3,126.85 and 987.95

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Solution

The fourth proportional to 2,083.88, 3,126.85 and 987.95 is: 1,482.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,083.88 : 3,126.85 = 987.95 : x
  2. Step 2: Convert to fraction form
    2,083.88/3,126.85 = 987.95/x
  3. Step 3: Cross multiply
    2,083.88x = 3,126.85 × 987.95
  4. Step 4: Simplify right side
    2,083.88x = 3,089,176.80
  5. Step 5: Solve for x
    x = 3,089,176.80/2,083.88
  6. Step 6: Final answer
    x = 1,482.41

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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.