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Finding the Fourth Proportional to 72.56, 108.68 and 36.40

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Solution

The fourth proportional to 72.56, 108.68 and 36.40 is: 54.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.56 : 108.68 = 36.40 : x
  2. Step 2: Convert to fraction form
    72.56/108.68 = 36.40/x
  3. Step 3: Cross multiply
    72.56x = 108.68 × 36.40
  4. Step 4: Simplify right side
    72.56x = 3,955.95
  5. Step 5: Solve for x
    x = 3,955.95/72.56
  6. Step 6: Final answer
    x = 54.52

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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.