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Finding the Fourth Proportional to 398.42, 597.78 and 155.02

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Solution

The fourth proportional to 398.42, 597.78 and 155.02 is: 232.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.42 : 597.78 = 155.02 : x
  2. Step 2: Convert to fraction form
    398.42/597.78 = 155.02/x
  3. Step 3: Cross multiply
    398.42x = 597.78 × 155.02
  4. Step 4: Simplify right side
    398.42x = 92,667.86
  5. Step 5: Solve for x
    x = 92,667.86/398.42
  6. Step 6: Final answer
    x = 232.59

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Why These Related Problems?

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