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Finding the Fourth Proportional to 72.76, 109.06 and 52.48

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Solution

The fourth proportional to 72.76, 109.06 and 52.48 is: 78.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.76 : 109.06 = 52.48 : x
  2. Step 2: Convert to fraction form
    72.76/109.06 = 52.48/x
  3. Step 3: Cross multiply
    72.76x = 109.06 × 52.48
  4. Step 4: Simplify right side
    72.76x = 5,723.47
  5. Step 5: Solve for x
    x = 5,723.47/72.76
  6. Step 6: Final answer
    x = 78.66

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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.