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Finding the Fourth Proportional to 46.15, 68.60 and 42.91

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Solution

The fourth proportional to 46.15, 68.60 and 42.91 is: 63.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.15 : 68.60 = 42.91 : x
  2. Step 2: Convert to fraction form
    46.15/68.60 = 42.91/x
  3. Step 3: Cross multiply
    46.15x = 68.60 × 42.91
  4. Step 4: Simplify right side
    46.15x = 2,943.56
  5. Step 5: Solve for x
    x = 2,943.56/46.15
  6. Step 6: Final answer
    x = 63.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.