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Finding the Fourth Proportional to 28.54, 42.78 and 15.01

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Solution

The fourth proportional to 28.54, 42.78 and 15.01 is: 22.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.54 : 42.78 = 15.01 : x
  2. Step 2: Convert to fraction form
    28.54/42.78 = 15.01/x
  3. Step 3: Cross multiply
    28.54x = 42.78 × 15.01
  4. Step 4: Simplify right side
    28.54x = 642.13
  5. Step 5: Solve for x
    x = 642.13/28.54
  6. Step 6: Final answer
    x = 22.50

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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.