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Finding the Fourth Proportional to 38.84, 58 and 31.64

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Solution

The fourth proportional to 38.84, 58 and 31.64 is: 47.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.84 : 58 = 31.64 : x
  2. Step 2: Convert to fraction form
    38.84/58 = 31.64/x
  3. Step 3: Cross multiply
    38.84x = 58 × 31.64
  4. Step 4: Simplify right side
    38.84x = 1,835.12
  5. Step 5: Solve for x
    x = 1,835.12/38.84
  6. Step 6: Final answer
    x = 47.25

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.