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Finding the Fourth Proportional to 40.18, 55.43 and 25.43

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Solution

The fourth proportional to 40.18, 55.43 and 25.43 is: 35.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.18 : 55.43 = 25.43 : x
  2. Step 2: Convert to fraction form
    40.18/55.43 = 25.43/x
  3. Step 3: Cross multiply
    40.18x = 55.43 × 25.43
  4. Step 4: Simplify right side
    40.18x = 1,409.50
  5. Step 5: Solve for x
    x = 1,409.50/40.18
  6. Step 6: Final answer
    x = 35.08

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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.