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Finding the Fourth Proportional to 30.66, 42.31 and 19

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Solution

The fourth proportional to 30.66, 42.31 and 19 is: 26.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.66 : 42.31 = 19 : x
  2. Step 2: Convert to fraction form
    30.66/42.31 = 19/x
  3. Step 3: Cross multiply
    30.66x = 42.31 × 19
  4. Step 4: Simplify right side
    30.66x = 803.89
  5. Step 5: Solve for x
    x = 803.89/30.66
  6. Step 6: Final answer
    x = 26.22

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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.