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Finding the Fourth Proportional to 342.45, 471.74 and 287.15

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Solution

The fourth proportional to 342.45, 471.74 and 287.15 is: 395.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.45 : 471.74 = 287.15 : x
  2. Step 2: Convert to fraction form
    342.45/471.74 = 287.15/x
  3. Step 3: Cross multiply
    342.45x = 471.74 × 287.15
  4. Step 4: Simplify right side
    342.45x = 135,456.35
  5. Step 5: Solve for x
    x = 135,456.35/342.45
  6. Step 6: Final answer
    x = 395.55

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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.