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Finding the Fourth Proportional to 122.90, 184.30 and 54.36

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Solution

The fourth proportional to 122.90, 184.30 and 54.36 is: 81.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.90 : 184.30 = 54.36 : x
  2. Step 2: Convert to fraction form
    122.90/184.30 = 54.36/x
  3. Step 3: Cross multiply
    122.90x = 184.30 × 54.36
  4. Step 4: Simplify right side
    122.90x = 10,018.55
  5. Step 5: Solve for x
    x = 10,018.55/122.90
  6. Step 6: Final answer
    x = 81.52

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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.