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Finding the Fourth Proportional to 285.06, 393.12 and 213.88

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Solution

The fourth proportional to 285.06, 393.12 and 213.88 is: 294.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.06 : 393.12 = 213.88 : x
  2. Step 2: Convert to fraction form
    285.06/393.12 = 213.88/x
  3. Step 3: Cross multiply
    285.06x = 393.12 × 213.88
  4. Step 4: Simplify right side
    285.06x = 84,080.51
  5. Step 5: Solve for x
    x = 84,080.51/285.06
  6. Step 6: Final answer
    x = 294.96

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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.