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Finding the Fourth Proportional to 40.04, 55.28 and 30.81

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Solution

The fourth proportional to 40.04, 55.28 and 30.81 is: 42.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.04 : 55.28 = 30.81 : x
  2. Step 2: Convert to fraction form
    40.04/55.28 = 30.81/x
  3. Step 3: Cross multiply
    40.04x = 55.28 × 30.81
  4. Step 4: Simplify right side
    40.04x = 1,703.46
  5. Step 5: Solve for x
    x = 1,703.46/40.04
  6. Step 6: Final answer
    x = 42.54

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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.