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Finding the Fourth Proportional to 139.27, 191.70 and 117.01

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Solution

The fourth proportional to 139.27, 191.70 and 117.01 is: 161.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.27 : 191.70 = 117.01 : x
  2. Step 2: Convert to fraction form
    139.27/191.70 = 117.01/x
  3. Step 3: Cross multiply
    139.27x = 191.70 × 117.01
  4. Step 4: Simplify right side
    139.27x = 22,430.82
  5. Step 5: Solve for x
    x = 22,430.82/139.27
  6. Step 6: Final answer
    x = 161.06

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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.