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Finding the Fourth Proportional to 342.40, 472.94 and 287.42

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Solution

The fourth proportional to 342.40, 472.94 and 287.42 is: 397.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.40 : 472.94 = 287.42 : x
  2. Step 2: Convert to fraction form
    342.40/472.94 = 287.42/x
  3. Step 3: Cross multiply
    342.40x = 472.94 × 287.42
  4. Step 4: Simplify right side
    342.40x = 135,930.05
  5. Step 5: Solve for x
    x = 135,930.05/342.40
  6. Step 6: Final answer
    x = 397.00

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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.