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Finding the Fourth Proportional to 402.21, 603.48 and 155.43

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Solution

The fourth proportional to 402.21, 603.48 and 155.43 is: 233.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.21 : 603.48 = 155.43 : x
  2. Step 2: Convert to fraction form
    402.21/603.48 = 155.43/x
  3. Step 3: Cross multiply
    402.21x = 603.48 × 155.43
  4. Step 4: Simplify right side
    402.21x = 93,798.90
  5. Step 5: Solve for x
    x = 93,798.90/402.21
  6. Step 6: Final answer
    x = 233.21

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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.