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Finding the Fourth Proportional to 398.52, 598.02 and 142

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Solution

The fourth proportional to 398.52, 598.02 and 142 is: 213.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.52 : 598.02 = 142 : x
  2. Step 2: Convert to fraction form
    398.52/598.02 = 142/x
  3. Step 3: Cross multiply
    398.52x = 598.02 × 142
  4. Step 4: Simplify right side
    398.52x = 84,918.84
  5. Step 5: Solve for x
    x = 84,918.84/398.52
  6. Step 6: Final answer
    x = 213.09

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.