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Finding the Fourth Proportional to 139.04, 207.08 and 131.72

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Solution

The fourth proportional to 139.04, 207.08 and 131.72 is: 196.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.04 : 207.08 = 131.72 : x
  2. Step 2: Convert to fraction form
    139.04/207.08 = 131.72/x
  3. Step 3: Cross multiply
    139.04x = 207.08 × 131.72
  4. Step 4: Simplify right side
    139.04x = 27,275.89
  5. Step 5: Solve for x
    x = 27,275.89/139.04
  6. Step 6: Final answer
    x = 196.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.