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Finding the Fourth Proportional to 786.62, 1,086.14 and 492.42

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Solution

The fourth proportional to 786.62, 1,086.14 and 492.42 is: 679.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.62 : 1,086.14 = 492.42 : x
  2. Step 2: Convert to fraction form
    786.62/1,086.14 = 492.42/x
  3. Step 3: Cross multiply
    786.62x = 1,086.14 × 492.42
  4. Step 4: Simplify right side
    786.62x = 534,837.06
  5. Step 5: Solve for x
    x = 534,837.06/786.62
  6. Step 6: Final answer
    x = 679.92

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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.