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Finding the Fourth Proportional to 1,959.89, 2,937.51 and 861.95

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Solution

The fourth proportional to 1,959.89, 2,937.51 and 861.95 is: 1,291.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.89 : 2,937.51 = 861.95 : x
  2. Step 2: Convert to fraction form
    1,959.89/2,937.51 = 861.95/x
  3. Step 3: Cross multiply
    1,959.89x = 2,937.51 × 861.95
  4. Step 4: Simplify right side
    1,959.89x = 2,531,994.09
  5. Step 5: Solve for x
    x = 2,531,994.09/1,959.89
  6. Step 6: Final answer
    x = 1,291.91

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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.