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Finding the Fourth Proportional to 89.19, 133.92 and 78.93

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Solution

The fourth proportional to 89.19, 133.92 and 78.93 is: 118.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.19 : 133.92 = 78.93 : x
  2. Step 2: Convert to fraction form
    89.19/133.92 = 78.93/x
  3. Step 3: Cross multiply
    89.19x = 133.92 × 78.93
  4. Step 4: Simplify right side
    89.19x = 10,570.31
  5. Step 5: Solve for x
    x = 10,570.31/89.19
  6. Step 6: Final answer
    x = 118.51

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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.