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Finding the Fourth Proportional to 34.90, 48.16 and 20.35

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Solution

The fourth proportional to 34.90, 48.16 and 20.35 is: 28.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.90 : 48.16 = 20.35 : x
  2. Step 2: Convert to fraction form
    34.90/48.16 = 20.35/x
  3. Step 3: Cross multiply
    34.90x = 48.16 × 20.35
  4. Step 4: Simplify right side
    34.90x = 979.95
  5. Step 5: Solve for x
    x = 979.95/34.90
  6. Step 6: Final answer
    x = 28.08

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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.