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Finding the Fourth Proportional to 47.94, 72.12 and 34.50

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Solution

The fourth proportional to 47.94, 72.12 and 34.50 is: 51.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.94 : 72.12 = 34.50 : x
  2. Step 2: Convert to fraction form
    47.94/72.12 = 34.50/x
  3. Step 3: Cross multiply
    47.94x = 72.12 × 34.50
  4. Step 4: Simplify right side
    47.94x = 2,488.14
  5. Step 5: Solve for x
    x = 2,488.14/47.94
  6. Step 6: Final answer
    x = 51.90

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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.