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Finding the Fourth Proportional to 35.36, 48.80 and 21.55

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Solution

The fourth proportional to 35.36, 48.80 and 21.55 is: 29.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.36 : 48.80 = 21.55 : x
  2. Step 2: Convert to fraction form
    35.36/48.80 = 21.55/x
  3. Step 3: Cross multiply
    35.36x = 48.80 × 21.55
  4. Step 4: Simplify right side
    35.36x = 1,051.64
  5. Step 5: Solve for x
    x = 1,051.64/35.36
  6. Step 6: Final answer
    x = 29.74

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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.