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Finding the Fourth Proportional to 38.64, 53.64 and 38.28

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Solution

The fourth proportional to 38.64, 53.64 and 38.28 is: 53.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.64 : 53.64 = 38.28 : x
  2. Step 2: Convert to fraction form
    38.64/53.64 = 38.28/x
  3. Step 3: Cross multiply
    38.64x = 53.64 × 38.28
  4. Step 4: Simplify right side
    38.64x = 2,053.34
  5. Step 5: Solve for x
    x = 2,053.34/38.64
  6. Step 6: Final answer
    x = 53.14

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.