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Finding the Fourth Proportional to 42.21, 63.30 and 15.15

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Solution

The fourth proportional to 42.21, 63.30 and 15.15 is: 22.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.21 : 63.30 = 15.15 : x
  2. Step 2: Convert to fraction form
    42.21/63.30 = 15.15/x
  3. Step 3: Cross multiply
    42.21x = 63.30 × 15.15
  4. Step 4: Simplify right side
    42.21x = 959.00
  5. Step 5: Solve for x
    x = 959.00/42.21
  6. Step 6: Final answer
    x = 22.72

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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.