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Finding the Fourth Proportional to 46.51, 69.72 and 28.42

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Solution

The fourth proportional to 46.51, 69.72 and 28.42 is: 42.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.51 : 69.72 = 28.42 : x
  2. Step 2: Convert to fraction form
    46.51/69.72 = 28.42/x
  3. Step 3: Cross multiply
    46.51x = 69.72 × 28.42
  4. Step 4: Simplify right side
    46.51x = 1,981.44
  5. Step 5: Solve for x
    x = 1,981.44/46.51
  6. Step 6: Final answer
    x = 42.60

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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.