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Finding the Fourth Proportional to 139.15, 207.58 and 129.33

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Solution

The fourth proportional to 139.15, 207.58 and 129.33 is: 192.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.15 : 207.58 = 129.33 : x
  2. Step 2: Convert to fraction form
    139.15/207.58 = 129.33/x
  3. Step 3: Cross multiply
    139.15x = 207.58 × 129.33
  4. Step 4: Simplify right side
    139.15x = 26,846.24
  5. Step 5: Solve for x
    x = 26,846.24/139.15
  6. Step 6: Final answer
    x = 192.93

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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.