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Finding the Fourth Proportional to 70.66, 96.40 and 70.12

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Solution

The fourth proportional to 70.66, 96.40 and 70.12 is: 95.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.66 : 96.40 = 70.12 : x
  2. Step 2: Convert to fraction form
    70.66/96.40 = 70.12/x
  3. Step 3: Cross multiply
    70.66x = 96.40 × 70.12
  4. Step 4: Simplify right side
    70.66x = 6,759.57
  5. Step 5: Solve for x
    x = 6,759.57/70.66
  6. Step 6: Final answer
    x = 95.66

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.