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Finding the Fourth Proportional to 139, 208.51 and 122.10

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Solution

The fourth proportional to 139, 208.51 and 122.10 is: 183.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    139 : 208.51 = 122.10 : x
  2. Step 2: Convert to fraction form
    139/208.51 = 122.10/x
  3. Step 3: Cross multiply
    139x = 208.51 × 122.10
  4. Step 4: Simplify right side
    139x = 25,459.07
  5. Step 5: Solve for x
    x = 25,459.07/139
  6. Step 6: Final answer
    x = 183.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.