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Finding the Fourth Proportional to 139.50, 207.63 and 136.08

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Solution

The fourth proportional to 139.50, 207.63 and 136.08 is: 202.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.50 : 207.63 = 136.08 : x
  2. Step 2: Convert to fraction form
    139.50/207.63 = 136.08/x
  3. Step 3: Cross multiply
    139.50x = 207.63 × 136.08
  4. Step 4: Simplify right side
    139.50x = 28,254.29
  5. Step 5: Solve for x
    x = 28,254.29/139.50
  6. Step 6: Final answer
    x = 202.54

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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.