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Finding the Fourth Proportional to 109.71, 151.44 and 70.38

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Solution

The fourth proportional to 109.71, 151.44 and 70.38 is: 97.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.71 : 151.44 = 70.38 : x
  2. Step 2: Convert to fraction form
    109.71/151.44 = 70.38/x
  3. Step 3: Cross multiply
    109.71x = 151.44 × 70.38
  4. Step 4: Simplify right side
    109.71x = 10,658.35
  5. Step 5: Solve for x
    x = 10,658.35/109.71
  6. Step 6: Final answer
    x = 97.15

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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.