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Finding the Fourth Proportional to 78.97, 109.03 and 52.76

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Solution

The fourth proportional to 78.97, 109.03 and 52.76 is: 72.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.97 : 109.03 = 52.76 : x
  2. Step 2: Convert to fraction form
    78.97/109.03 = 52.76/x
  3. Step 3: Cross multiply
    78.97x = 109.03 × 52.76
  4. Step 4: Simplify right side
    78.97x = 5,752.42
  5. Step 5: Solve for x
    x = 5,752.42/78.97
  6. Step 6: Final answer
    x = 72.84

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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.