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Finding the Fourth Proportional to 284.85, 393.11 and 215.06

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Solution

The fourth proportional to 284.85, 393.11 and 215.06 is: 296.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.85 : 393.11 = 215.06 : x
  2. Step 2: Convert to fraction form
    284.85/393.11 = 215.06/x
  3. Step 3: Cross multiply
    284.85x = 393.11 × 215.06
  4. Step 4: Simplify right side
    284.85x = 84,539.20
  5. Step 5: Solve for x
    x = 84,539.20/284.85
  6. Step 6: Final answer
    x = 296.78

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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.