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Finding the Fourth Proportional to 47.74, 65.87 and 31.38

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Solution

The fourth proportional to 47.74, 65.87 and 31.38 is: 43.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.74 : 65.87 = 31.38 : x
  2. Step 2: Convert to fraction form
    47.74/65.87 = 31.38/x
  3. Step 3: Cross multiply
    47.74x = 65.87 × 31.38
  4. Step 4: Simplify right side
    47.74x = 2,066.51
  5. Step 5: Solve for x
    x = 2,066.51/47.74
  6. Step 6: Final answer
    x = 43.29

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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.