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Finding the Fourth Proportional to 70.24, 97.40 and 67.72

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Solution

The fourth proportional to 70.24, 97.40 and 67.72 is: 93.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.24 : 97.40 = 67.72 : x
  2. Step 2: Convert to fraction form
    70.24/97.40 = 67.72/x
  3. Step 3: Cross multiply
    70.24x = 97.40 × 67.72
  4. Step 4: Simplify right side
    70.24x = 6,595.93
  5. Step 5: Solve for x
    x = 6,595.93/70.24
  6. Step 6: Final answer
    x = 93.91

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.