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Finding the Fourth Proportional to 77.89, 117.43 and 72.67

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Solution

The fourth proportional to 77.89, 117.43 and 72.67 is: 109.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.89 : 117.43 = 72.67 : x
  2. Step 2: Convert to fraction form
    77.89/117.43 = 72.67/x
  3. Step 3: Cross multiply
    77.89x = 117.43 × 72.67
  4. Step 4: Simplify right side
    77.89x = 8,533.64
  5. Step 5: Solve for x
    x = 8,533.64/77.89
  6. Step 6: Final answer
    x = 109.56

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.