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Finding the Fourth Proportional to 34.95, 48.24 and 20.40

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Solution

The fourth proportional to 34.95, 48.24 and 20.40 is: 28.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.95 : 48.24 = 20.40 : x
  2. Step 2: Convert to fraction form
    34.95/48.24 = 20.40/x
  3. Step 3: Cross multiply
    34.95x = 48.24 × 20.40
  4. Step 4: Simplify right side
    34.95x = 984.17
  5. Step 5: Solve for x
    x = 984.17/34.95
  6. Step 6: Final answer
    x = 28.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.