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Finding the Fourth Proportional to 31.05, 46.59 and 28.53

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Solution

The fourth proportional to 31.05, 46.59 and 28.53 is: 42.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.05 : 46.59 = 28.53 : x
  2. Step 2: Convert to fraction form
    31.05/46.59 = 28.53/x
  3. Step 3: Cross multiply
    31.05x = 46.59 × 28.53
  4. Step 4: Simplify right side
    31.05x = 1,329.21
  5. Step 5: Solve for x
    x = 1,329.21/31.05
  6. Step 6: Final answer
    x = 42.81

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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.