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Finding the Fourth Proportional to 46.92, 70.32 and 19.85

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Solution

The fourth proportional to 46.92, 70.32 and 19.85 is: 29.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.92 : 70.32 = 19.85 : x
  2. Step 2: Convert to fraction form
    46.92/70.32 = 19.85/x
  3. Step 3: Cross multiply
    46.92x = 70.32 × 19.85
  4. Step 4: Simplify right side
    46.92x = 1,395.50
  5. Step 5: Solve for x
    x = 1,395.50/46.92
  6. Step 6: Final answer
    x = 29.74

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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.