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Finding the Fourth Proportional to 91.58, 137.72 and 79.64

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Solution

The fourth proportional to 91.58, 137.72 and 79.64 is: 119.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.58 : 137.72 = 79.64 : x
  2. Step 2: Convert to fraction form
    91.58/137.72 = 79.64/x
  3. Step 3: Cross multiply
    91.58x = 137.72 × 79.64
  4. Step 4: Simplify right side
    91.58x = 10,968.02
  5. Step 5: Solve for x
    x = 10,968.02/91.58
  6. Step 6: Final answer
    x = 119.76

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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.