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Finding the Fourth Proportional to 40.43, 55.79 and 30.08

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Solution

The fourth proportional to 40.43, 55.79 and 30.08 is: 41.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.43 : 55.79 = 30.08 : x
  2. Step 2: Convert to fraction form
    40.43/55.79 = 30.08/x
  3. Step 3: Cross multiply
    40.43x = 55.79 × 30.08
  4. Step 4: Simplify right side
    40.43x = 1,678.16
  5. Step 5: Solve for x
    x = 1,678.16/40.43
  6. Step 6: Final answer
    x = 41.51

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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.