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Finding the Fourth Proportional to 47.39, 70.98 and 21.67

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Solution

The fourth proportional to 47.39, 70.98 and 21.67 is: 32.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.39 : 70.98 = 21.67 : x
  2. Step 2: Convert to fraction form
    47.39/70.98 = 21.67/x
  3. Step 3: Cross multiply
    47.39x = 70.98 × 21.67
  4. Step 4: Simplify right side
    47.39x = 1,537.88
  5. Step 5: Solve for x
    x = 1,537.88/47.39
  6. Step 6: Final answer
    x = 32.45

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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.