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Finding the Fourth Proportional to 228.40, 342.15 and 112.51

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Solution

The fourth proportional to 228.40, 342.15 and 112.51 is: 168.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.40 : 342.15 = 112.51 : x
  2. Step 2: Convert to fraction form
    228.40/342.15 = 112.51/x
  3. Step 3: Cross multiply
    228.40x = 342.15 × 112.51
  4. Step 4: Simplify right side
    228.40x = 38,495.30
  5. Step 5: Solve for x
    x = 38,495.30/228.40
  6. Step 6: Final answer
    x = 168.54

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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.