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Finding the Fourth Proportional to 46.91, 70.31 and 29.78

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Solution

The fourth proportional to 46.91, 70.31 and 29.78 is: 44.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.91 : 70.31 = 29.78 : x
  2. Step 2: Convert to fraction form
    46.91/70.31 = 29.78/x
  3. Step 3: Cross multiply
    46.91x = 70.31 × 29.78
  4. Step 4: Simplify right side
    46.91x = 2,093.82
  5. Step 5: Solve for x
    x = 2,093.82/46.91
  6. Step 6: Final answer
    x = 44.63

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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.