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Finding the Fourth Proportional to 228.57, 342.92 and 74.51

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Solution

The fourth proportional to 228.57, 342.92 and 74.51 is: 111.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.57 : 342.92 = 74.51 : x
  2. Step 2: Convert to fraction form
    228.57/342.92 = 74.51/x
  3. Step 3: Cross multiply
    228.57x = 342.92 × 74.51
  4. Step 4: Simplify right side
    228.57x = 25,550.31
  5. Step 5: Solve for x
    x = 25,550.31/228.57
  6. Step 6: Final answer
    x = 111.78

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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.