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Finding the Fourth Proportional to 47, 70.49 and 21.31

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Solution

The fourth proportional to 47, 70.49 and 21.31 is: 31.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    47 : 70.49 = 21.31 : x
  2. Step 2: Convert to fraction form
    47/70.49 = 21.31/x
  3. Step 3: Cross multiply
    47x = 70.49 × 21.31
  4. Step 4: Simplify right side
    47x = 1,502.14
  5. Step 5: Solve for x
    x = 1,502.14/47
  6. Step 6: Final answer
    x = 31.96

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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.