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Finding the Fourth Proportional to 70.74, 97.62 and 39.65

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Solution

The fourth proportional to 70.74, 97.62 and 39.65 is: 54.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.74 : 97.62 = 39.65 : x
  2. Step 2: Convert to fraction form
    70.74/97.62 = 39.65/x
  3. Step 3: Cross multiply
    70.74x = 97.62 × 39.65
  4. Step 4: Simplify right side
    70.74x = 3,870.63
  5. Step 5: Solve for x
    x = 3,870.63/70.74
  6. Step 6: Final answer
    x = 54.72

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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.