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Finding the Fourth Proportional to 18.45, 25.43 and 18.23

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Solution

The fourth proportional to 18.45, 25.43 and 18.23 is: 25.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.45 : 25.43 = 18.23 : x
  2. Step 2: Convert to fraction form
    18.45/25.43 = 18.23/x
  3. Step 3: Cross multiply
    18.45x = 25.43 × 18.23
  4. Step 4: Simplify right side
    18.45x = 463.37
  5. Step 5: Solve for x
    x = 463.37/18.45
  6. Step 6: Final answer
    x = 25.11

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1.5x scale

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.