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Finding the Fourth Proportional to 38.89, 53.51 and 38.64

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Solution

The fourth proportional to 38.89, 53.51 and 38.64 is: 53.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.89 : 53.51 = 38.64 : x
  2. Step 2: Convert to fraction form
    38.89/53.51 = 38.64/x
  3. Step 3: Cross multiply
    38.89x = 53.51 × 38.64
  4. Step 4: Simplify right side
    38.89x = 2,067.63
  5. Step 5: Solve for x
    x = 2,067.63/38.89
  6. Step 6: Final answer
    x = 53.17

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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.