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Finding the Fourth Proportional to 38.58, 53.26 and 31.39

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Solution

The fourth proportional to 38.58, 53.26 and 31.39 is: 43.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.58 : 53.26 = 31.39 : x
  2. Step 2: Convert to fraction form
    38.58/53.26 = 31.39/x
  3. Step 3: Cross multiply
    38.58x = 53.26 × 31.39
  4. Step 4: Simplify right side
    38.58x = 1,671.62
  5. Step 5: Solve for x
    x = 1,671.62/38.58
  6. Step 6: Final answer
    x = 43.33

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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.