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Finding the Fourth Proportional to 38.72, 58.05 and 18.45

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Solution

The fourth proportional to 38.72, 58.05 and 18.45 is: 27.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.72 : 58.05 = 18.45 : x
  2. Step 2: Convert to fraction form
    38.72/58.05 = 18.45/x
  3. Step 3: Cross multiply
    38.72x = 58.05 × 18.45
  4. Step 4: Simplify right side
    38.72x = 1,071.02
  5. Step 5: Solve for x
    x = 1,071.02/38.72
  6. Step 6: Final answer
    x = 27.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.