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Finding the Fourth Proportional to 122.51, 183.86 and 71.15

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Solution

The fourth proportional to 122.51, 183.86 and 71.15 is: 106.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.51 : 183.86 = 71.15 : x
  2. Step 2: Convert to fraction form
    122.51/183.86 = 71.15/x
  3. Step 3: Cross multiply
    122.51x = 183.86 × 71.15
  4. Step 4: Simplify right side
    122.51x = 13,080.36
  5. Step 5: Solve for x
    x = 13,080.36/122.51
  6. Step 6: Final answer
    x = 106.77

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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.