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Finding the Fourth Proportional to 47.06, 70.54 and 21.39

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Solution

The fourth proportional to 47.06, 70.54 and 21.39 is: 32.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.06 : 70.54 = 21.39 : x
  2. Step 2: Convert to fraction form
    47.06/70.54 = 21.39/x
  3. Step 3: Cross multiply
    47.06x = 70.54 × 21.39
  4. Step 4: Simplify right side
    47.06x = 1,508.85
  5. Step 5: Solve for x
    x = 1,508.85/47.06
  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.