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Finding the Fourth Proportional to 72.60, 100.08 and 54.18

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Solution

The fourth proportional to 72.60, 100.08 and 54.18 is: 74.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.60 : 100.08 = 54.18 : x
  2. Step 2: Convert to fraction form
    72.60/100.08 = 54.18/x
  3. Step 3: Cross multiply
    72.60x = 100.08 × 54.18
  4. Step 4: Simplify right side
    72.60x = 5,422.33
  5. Step 5: Solve for x
    x = 5,422.33/72.60
  6. Step 6: Final answer
    x = 74.69

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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.