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Finding the Fourth Proportional to 426.30, 639.34 and 270.07

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Solution

The fourth proportional to 426.30, 639.34 and 270.07 is: 405.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.30 : 639.34 = 270.07 : x
  2. Step 2: Convert to fraction form
    426.30/639.34 = 270.07/x
  3. Step 3: Cross multiply
    426.30x = 639.34 × 270.07
  4. Step 4: Simplify right side
    426.30x = 172,666.55
  5. Step 5: Solve for x
    x = 172,666.55/426.30
  6. Step 6: Final answer
    x = 405.04

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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.