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Finding the Fourth Proportional to 38.37, 52.90 and 31.45

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Solution

The fourth proportional to 38.37, 52.90 and 31.45 is: 43.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.37 : 52.90 = 31.45 : x
  2. Step 2: Convert to fraction form
    38.37/52.90 = 31.45/x
  3. Step 3: Cross multiply
    38.37x = 52.90 × 31.45
  4. Step 4: Simplify right side
    38.37x = 1,663.71
  5. Step 5: Solve for x
    x = 1,663.71/38.37
  6. Step 6: Final answer
    x = 43.36

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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.