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Finding the Fourth Proportional to 19.31, 29.18 and 18.19

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Solution

The fourth proportional to 19.31, 29.18 and 18.19 is: 27.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.31 : 29.18 = 18.19 : x
  2. Step 2: Convert to fraction form
    19.31/29.18 = 18.19/x
  3. Step 3: Cross multiply
    19.31x = 29.18 × 18.19
  4. Step 4: Simplify right side
    19.31x = 530.76
  5. Step 5: Solve for x
    x = 530.76/19.31
  6. Step 6: Final answer
    x = 27.49

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.