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Finding the Fourth Proportional to 342.12, 472.32 and 228.65

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Solution

The fourth proportional to 342.12, 472.32 and 228.65 is: 315.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.12 : 472.32 = 228.65 : x
  2. Step 2: Convert to fraction form
    342.12/472.32 = 228.65/x
  3. Step 3: Cross multiply
    342.12x = 472.32 × 228.65
  4. Step 4: Simplify right side
    342.12x = 107,993.61
  5. Step 5: Solve for x
    x = 107,993.61/342.12
  6. Step 6: Final answer
    x = 315.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.