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Finding the Fourth Proportional to 995.79, 1,372.97 and 860.95

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Solution

The fourth proportional to 995.79, 1,372.97 and 860.95 is: 1,187.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.79 : 1,372.97 = 860.95 : x
  2. Step 2: Convert to fraction form
    995.79/1,372.97 = 860.95/x
  3. Step 3: Cross multiply
    995.79x = 1,372.97 × 860.95
  4. Step 4: Simplify right side
    995.79x = 1,182,058.52
  5. Step 5: Solve for x
    x = 1,182,058.52/995.79
  6. Step 6: Final answer
    x = 1,187.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.