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Finding the Fourth Proportional to 97.15, 134.16 and 67.72

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Solution

The fourth proportional to 97.15, 134.16 and 67.72 is: 93.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.15 : 134.16 = 67.72 : x
  2. Step 2: Convert to fraction form
    97.15/134.16 = 67.72/x
  3. Step 3: Cross multiply
    97.15x = 134.16 × 67.72
  4. Step 4: Simplify right side
    97.15x = 9,085.32
  5. Step 5: Solve for x
    x = 9,085.32/97.15
  6. Step 6: Final answer
    x = 93.52

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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.