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Finding the Fourth Proportional to 116.10, 173.88 and 91.80

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Solution

The fourth proportional to 116.10, 173.88 and 91.80 is: 137.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.10 : 173.88 = 91.80 : x
  2. Step 2: Convert to fraction form
    116.10/173.88 = 91.80/x
  3. Step 3: Cross multiply
    116.10x = 173.88 × 91.80
  4. Step 4: Simplify right side
    116.10x = 15,962.18
  5. Step 5: Solve for x
    x = 15,962.18/116.10
  6. Step 6: Final answer
    x = 137.49

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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.