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Finding the Fourth Proportional to 46.82, 70.24 and 19.80

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Solution

The fourth proportional to 46.82, 70.24 and 19.80 is: 29.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.82 : 70.24 = 19.80 : x
  2. Step 2: Convert to fraction form
    46.82/70.24 = 19.80/x
  3. Step 3: Cross multiply
    46.82x = 70.24 × 19.80
  4. Step 4: Simplify right side
    46.82x = 1,390.75
  5. Step 5: Solve for x
    x = 1,390.75/46.82
  6. Step 6: Final answer
    x = 29.70

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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.