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Finding the Fourth Proportional to 89.25, 133.93 and 28.40

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Solution

The fourth proportional to 89.25, 133.93 and 28.40 is: 42.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.25 : 133.93 = 28.40 : x
  2. Step 2: Convert to fraction form
    89.25/133.93 = 28.40/x
  3. Step 3: Cross multiply
    89.25x = 133.93 × 28.40
  4. Step 4: Simplify right side
    89.25x = 3,803.65
  5. Step 5: Solve for x
    x = 3,803.65/89.25
  6. Step 6: Final answer
    x = 42.62

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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.