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Finding the Fourth Proportional to 842.12, 1,263.45 and 257.14

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Solution

The fourth proportional to 842.12, 1,263.45 and 257.14 is: 385.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.12 : 1,263.45 = 257.14 : x
  2. Step 2: Convert to fraction form
    842.12/1,263.45 = 257.14/x
  3. Step 3: Cross multiply
    842.12x = 1,263.45 × 257.14
  4. Step 4: Simplify right side
    842.12x = 324,883.53
  5. Step 5: Solve for x
    x = 324,883.53/842.12
  6. Step 6: Final answer
    x = 385.79

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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.