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Finding the Fourth Proportional to 99.70, 137.44 and 70.15

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Solution

The fourth proportional to 99.70, 137.44 and 70.15 is: 96.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.70 : 137.44 = 70.15 : x
  2. Step 2: Convert to fraction form
    99.70/137.44 = 70.15/x
  3. Step 3: Cross multiply
    99.70x = 137.44 × 70.15
  4. Step 4: Simplify right side
    99.70x = 9,641.42
  5. Step 5: Solve for x
    x = 9,641.42/99.70
  6. Step 6: Final answer
    x = 96.71

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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.