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Finding the Fourth Proportional to 402.82, 556.09 and 284.90

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Solution

The fourth proportional to 402.82, 556.09 and 284.90 is: 393.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.82 : 556.09 = 284.90 : x
  2. Step 2: Convert to fraction form
    402.82/556.09 = 284.90/x
  3. Step 3: Cross multiply
    402.82x = 556.09 × 284.90
  4. Step 4: Simplify right side
    402.82x = 158,426.55
  5. Step 5: Solve for x
    x = 158,426.55/402.82
  6. Step 6: Final answer
    x = 393.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.