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Finding the Fourth Proportional to 65.28, 97.79 and 47.19

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Solution

The fourth proportional to 65.28, 97.79 and 47.19 is: 70.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.28 : 97.79 = 47.19 : x
  2. Step 2: Convert to fraction form
    65.28/97.79 = 47.19/x
  3. Step 3: Cross multiply
    65.28x = 97.79 × 47.19
  4. Step 4: Simplify right side
    65.28x = 4,614.47
  5. Step 5: Solve for x
    x = 4,614.47/65.28
  6. Step 6: Final answer
    x = 70.69

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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.