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Finding the Fourth Proportional to 47.98, 71.78 and 40.36

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Solution

The fourth proportional to 47.98, 71.78 and 40.36 is: 60.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.98 : 71.78 = 40.36 : x
  2. Step 2: Convert to fraction form
    47.98/71.78 = 40.36/x
  3. Step 3: Cross multiply
    47.98x = 71.78 × 40.36
  4. Step 4: Simplify right side
    47.98x = 2,897.04
  5. Step 5: Solve for x
    x = 2,897.04/47.98
  6. Step 6: Final answer
    x = 60.38

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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.