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Finding the Fourth Proportional to 51.87, 78.10 and 46.21

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Solution

The fourth proportional to 51.87, 78.10 and 46.21 is: 69.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.87 : 78.10 = 46.21 : x
  2. Step 2: Convert to fraction form
    51.87/78.10 = 46.21/x
  3. Step 3: Cross multiply
    51.87x = 78.10 × 46.21
  4. Step 4: Simplify right side
    51.87x = 3,608.92
  5. Step 5: Solve for x
    x = 3,608.92/51.87
  6. Step 6: Final answer
    x = 69.58

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.