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Finding the Fourth Proportional to 342.78, 472.47 and 330.02

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Solution

The fourth proportional to 342.78, 472.47 and 330.02 is: 454.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.78 : 472.47 = 330.02 : x
  2. Step 2: Convert to fraction form
    342.78/472.47 = 330.02/x
  3. Step 3: Cross multiply
    342.78x = 472.47 × 330.02
  4. Step 4: Simplify right side
    342.78x = 155,922.19
  5. Step 5: Solve for x
    x = 155,922.19/342.78
  6. Step 6: Final answer
    x = 454.88

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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.