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Finding the Fourth Proportional to 70.14, 96.30 and 66.19

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Solution

The fourth proportional to 70.14, 96.30 and 66.19 is: 90.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.14 : 96.30 = 66.19 : x
  2. Step 2: Convert to fraction form
    70.14/96.30 = 66.19/x
  3. Step 3: Cross multiply
    70.14x = 96.30 × 66.19
  4. Step 4: Simplify right side
    70.14x = 6,374.10
  5. Step 5: Solve for x
    x = 6,374.10/70.14
  6. Step 6: Final answer
    x = 90.88

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.