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Finding the Fourth Proportional to 76.97, 106.19 and 47.45

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Solution

The fourth proportional to 76.97, 106.19 and 47.45 is: 65.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.97 : 106.19 = 47.45 : x
  2. Step 2: Convert to fraction form
    76.97/106.19 = 47.45/x
  3. Step 3: Cross multiply
    76.97x = 106.19 × 47.45
  4. Step 4: Simplify right side
    76.97x = 5,039.19
  5. Step 5: Solve for x
    x = 5,039.19/76.97
  6. Step 6: Final answer
    x = 65.47

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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.