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Finding the Fourth Proportional to 47.05, 70.52 and 21.39

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Solution

The fourth proportional to 47.05, 70.52 and 21.39 is: 32.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.05 : 70.52 = 21.39 : x
  2. Step 2: Convert to fraction form
    47.05/70.52 = 21.39/x
  3. Step 3: Cross multiply
    47.05x = 70.52 × 21.39
  4. Step 4: Simplify right side
    47.05x = 1,508.42
  5. Step 5: Solve for x
    x = 1,508.42/47.05
  6. Step 6: Final answer
    x = 32.06

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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.