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Finding the Fourth Proportional to 18.70, 27.90 and 18.29

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Solution

The fourth proportional to 18.70, 27.90 and 18.29 is: 27.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.70 : 27.90 = 18.29 : x
  2. Step 2: Convert to fraction form
    18.70/27.90 = 18.29/x
  3. Step 3: Cross multiply
    18.70x = 27.90 × 18.29
  4. Step 4: Simplify right side
    18.70x = 510.29
  5. Step 5: Solve for x
    x = 510.29/18.70
  6. Step 6: Final answer
    x = 27.29

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.