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Finding the Fourth Proportional to 857.71, 1,286.07 and 492.58

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Solution

The fourth proportional to 857.71, 1,286.07 and 492.58 is: 738.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.71 : 1,286.07 = 492.58 : x
  2. Step 2: Convert to fraction form
    857.71/1,286.07 = 492.58/x
  3. Step 3: Cross multiply
    857.71x = 1,286.07 × 492.58
  4. Step 4: Simplify right side
    857.71x = 633,492.36
  5. Step 5: Solve for x
    x = 633,492.36/857.71
  6. Step 6: Final answer
    x = 738.59

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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.