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Finding the Fourth Proportional to 47.90, 71.69 and 45.17

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Solution

The fourth proportional to 47.90, 71.69 and 45.17 is: 67.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.90 : 71.69 = 45.17 : x
  2. Step 2: Convert to fraction form
    47.90/71.69 = 45.17/x
  3. Step 3: Cross multiply
    47.90x = 71.69 × 45.17
  4. Step 4: Simplify right side
    47.90x = 3,237.99
  5. Step 5: Solve for x
    x = 3,237.99/47.90
  6. Step 6: Final answer
    x = 67.60

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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.