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Finding the Fourth Proportional to 117.72, 162.60 and 91.80

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Solution

The fourth proportional to 117.72, 162.60 and 91.80 is: 126.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.72 : 162.60 = 91.80 : x
  2. Step 2: Convert to fraction form
    117.72/162.60 = 91.80/x
  3. Step 3: Cross multiply
    117.72x = 162.60 × 91.80
  4. Step 4: Simplify right side
    117.72x = 14,926.68
  5. Step 5: Solve for x
    x = 14,926.68/117.72
  6. Step 6: Final answer
    x = 126.80

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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.