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Finding the Fourth Proportional to 139, 207.54 and 122.60

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Solution

The fourth proportional to 139, 207.54 and 122.60 is: 183.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    139 : 207.54 = 122.60 : x
  2. Step 2: Convert to fraction form
    139/207.54 = 122.60/x
  3. Step 3: Cross multiply
    139x = 207.54 × 122.60
  4. Step 4: Simplify right side
    139x = 25,444.40
  5. Step 5: Solve for x
    x = 25,444.40/139
  6. Step 6: Final answer
    x = 183.05

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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.