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Finding the Fourth Proportional to 42.66, 63.99 and 15.21

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Solution

The fourth proportional to 42.66, 63.99 and 15.21 is: 22.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.66 : 63.99 = 15.21 : x
  2. Step 2: Convert to fraction form
    42.66/63.99 = 15.21/x
  3. Step 3: Cross multiply
    42.66x = 63.99 × 15.21
  4. Step 4: Simplify right side
    42.66x = 973.29
  5. Step 5: Solve for x
    x = 973.29/42.66
  6. Step 6: Final answer
    x = 22.82

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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.