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Finding the Fourth Proportional to 70.14, 96.89 and 67.18

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Solution

The fourth proportional to 70.14, 96.89 and 67.18 is: 92.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.14 : 96.89 = 67.18 : x
  2. Step 2: Convert to fraction form
    70.14/96.89 = 67.18/x
  3. Step 3: Cross multiply
    70.14x = 96.89 × 67.18
  4. Step 4: Simplify right side
    70.14x = 6,509.07
  5. Step 5: Solve for x
    x = 6,509.07/70.14
  6. Step 6: Final answer
    x = 92.80

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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.