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Finding the Fourth Proportional to 108,418.40, 163,016.40 and 91,311.20

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Solution

The fourth proportional to 108,418.40, 163,016.40 and 91,311.20 is: 137,294.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,418.40 : 163,016.40 = 91,311.20 : x
  2. Step 2: Convert to fraction form
    108,418.40/163,016.40 = 91,311.20/x
  3. Step 3: Cross multiply
    108,418.40x = 163,016.40 × 91,311.20
  4. Step 4: Simplify right side
    108,418.40x = 14,885,223,103.68
  5. Step 5: Solve for x
    x = 14,885,223,103.68/108,418.40
  6. Step 6: Final answer
    x = 137,294.25

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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.