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Finding the Fourth Proportional to 45.79, 68.61 and 28.65

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Solution

The fourth proportional to 45.79, 68.61 and 28.65 is: 42.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.79 : 68.61 = 28.65 : x
  2. Step 2: Convert to fraction form
    45.79/68.61 = 28.65/x
  3. Step 3: Cross multiply
    45.79x = 68.61 × 28.65
  4. Step 4: Simplify right side
    45.79x = 1,965.46
  5. Step 5: Solve for x
    x = 1,965.46/45.79
  6. Step 6: Final answer
    x = 42.92

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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.