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Finding the Fourth Proportional to 40.66, 56.09 and 30.85

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Solution

The fourth proportional to 40.66, 56.09 and 30.85 is: 42.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.66 : 56.09 = 30.85 : x
  2. Step 2: Convert to fraction form
    40.66/56.09 = 30.85/x
  3. Step 3: Cross multiply
    40.66x = 56.09 × 30.85
  4. Step 4: Simplify right side
    40.66x = 1,730.22
  5. Step 5: Solve for x
    x = 1,730.22/40.66
  6. Step 6: Final answer
    x = 42.55

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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.