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Finding the Fourth Proportional to 285.58, 393.87 and 206.74

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Solution

The fourth proportional to 285.58, 393.87 and 206.74 is: 285.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.58 : 393.87 = 206.74 : x
  2. Step 2: Convert to fraction form
    285.58/393.87 = 206.74/x
  3. Step 3: Cross multiply
    285.58x = 393.87 × 206.74
  4. Step 4: Simplify right side
    285.58x = 81,428.68
  5. Step 5: Solve for x
    x = 81,428.68/285.58
  6. Step 6: Final answer
    x = 285.13

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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.