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Finding the Fourth Proportional to 402.30, 603.45 and 272.70

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Solution

The fourth proportional to 402.30, 603.45 and 272.70 is: 409.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.30 : 603.45 = 272.70 : x
  2. Step 2: Convert to fraction form
    402.30/603.45 = 272.70/x
  3. Step 3: Cross multiply
    402.30x = 603.45 × 272.70
  4. Step 4: Simplify right side
    402.30x = 164,560.82
  5. Step 5: Solve for x
    x = 164,560.82/402.30
  6. Step 6: Final answer
    x = 409.05

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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.