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Finding the Fourth Proportional to 36.66, 50.58 and 21.12

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Solution

The fourth proportional to 36.66, 50.58 and 21.12 is: 29.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.66 : 50.58 = 21.12 : x
  2. Step 2: Convert to fraction form
    36.66/50.58 = 21.12/x
  3. Step 3: Cross multiply
    36.66x = 50.58 × 21.12
  4. Step 4: Simplify right side
    36.66x = 1,068.25
  5. Step 5: Solve for x
    x = 1,068.25/36.66
  6. Step 6: Final answer
    x = 29.14

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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.