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Finding the Fourth Proportional to 184.85, 254.98 and 128.75

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Solution

The fourth proportional to 184.85, 254.98 and 128.75 is: 177.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    184.85 : 254.98 = 128.75 : x
  2. Step 2: Convert to fraction form
    184.85/254.98 = 128.75/x
  3. Step 3: Cross multiply
    184.85x = 254.98 × 128.75
  4. Step 4: Simplify right side
    184.85x = 32,827.08
  5. Step 5: Solve for x
    x = 32,827.08/184.85
  6. Step 6: Final answer
    x = 177.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.