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Finding the Fourth Proportional to 77.98, 117.01 and 61.63

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Solution

The fourth proportional to 77.98, 117.01 and 61.63 is: 92.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.98 : 117.01 = 61.63 : x
  2. Step 2: Convert to fraction form
    77.98/117.01 = 61.63/x
  3. Step 3: Cross multiply
    77.98x = 117.01 × 61.63
  4. Step 4: Simplify right side
    77.98x = 7,211.33
  5. Step 5: Solve for x
    x = 7,211.33/77.98
  6. Step 6: Final answer
    x = 92.48

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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.