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Finding the Fourth Proportional to 38.61, 53.28 and 31.28

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Solution

The fourth proportional to 38.61, 53.28 and 31.28 is: 43.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.61 : 53.28 = 31.28 : x
  2. Step 2: Convert to fraction form
    38.61/53.28 = 31.28/x
  3. Step 3: Cross multiply
    38.61x = 53.28 × 31.28
  4. Step 4: Simplify right side
    38.61x = 1,666.33
  5. Step 5: Solve for x
    x = 1,666.33/38.61
  6. Step 6: Final answer
    x = 43.16

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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.