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Finding the Fourth Proportional to 39.66, 54.71 and 29.94

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Solution

The fourth proportional to 39.66, 54.71 and 29.94 is: 41.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.66 : 54.71 = 29.94 : x
  2. Step 2: Convert to fraction form
    39.66/54.71 = 29.94/x
  3. Step 3: Cross multiply
    39.66x = 54.71 × 29.94
  4. Step 4: Simplify right side
    39.66x = 1,638.02
  5. Step 5: Solve for x
    x = 1,638.02/39.66
  6. Step 6: Final answer
    x = 41.30

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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.