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Finding the Fourth Proportional to 342.74, 472.70 and 290.43

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Solution

The fourth proportional to 342.74, 472.70 and 290.43 is: 400.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.74 : 472.70 = 290.43 : x
  2. Step 2: Convert to fraction form
    342.74/472.70 = 290.43/x
  3. Step 3: Cross multiply
    342.74x = 472.70 × 290.43
  4. Step 4: Simplify right side
    342.74x = 137,284.81
  5. Step 5: Solve for x
    x = 137,284.81/342.74
  6. Step 6: Final answer
    x = 400.56

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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.