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Finding the Fourth Proportional to 39.70, 54.86 and 29.98

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Solution

The fourth proportional to 39.70, 54.86 and 29.98 is: 41.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.70 : 54.86 = 29.98 : x
  2. Step 2: Convert to fraction form
    39.70/54.86 = 29.98/x
  3. Step 3: Cross multiply
    39.70x = 54.86 × 29.98
  4. Step 4: Simplify right side
    39.70x = 1,644.70
  5. Step 5: Solve for x
    x = 1,644.70/39.70
  6. Step 6: Final answer
    x = 41.43

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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.