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Finding the Fourth Proportional to 842.92, 1,264.06 and 257.74

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Solution

The fourth proportional to 842.92, 1,264.06 and 257.74 is: 386.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.92 : 1,264.06 = 257.74 : x
  2. Step 2: Convert to fraction form
    842.92/1,264.06 = 257.74/x
  3. Step 3: Cross multiply
    842.92x = 1,264.06 × 257.74
  4. Step 4: Simplify right side
    842.92x = 325,799.76
  5. Step 5: Solve for x
    x = 325,799.76/842.92
  6. Step 6: Final answer
    x = 386.51

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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.