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Finding the Fourth Proportional to 398.75, 598.23 and 155.45

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Solution

The fourth proportional to 398.75, 598.23 and 155.45 is: 233.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.75 : 598.23 = 155.45 : x
  2. Step 2: Convert to fraction form
    398.75/598.23 = 155.45/x
  3. Step 3: Cross multiply
    398.75x = 598.23 × 155.45
  4. Step 4: Simplify right side
    398.75x = 92,996.35
  5. Step 5: Solve for x
    x = 92,996.35/398.75
  6. Step 6: Final answer
    x = 233.22

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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.