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Finding the Fourth Proportional to 992.39, 1,489.94 and 505.78

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Solution

The fourth proportional to 992.39, 1,489.94 and 505.78 is: 759.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.39 : 1,489.94 = 505.78 : x
  2. Step 2: Convert to fraction form
    992.39/1,489.94 = 505.78/x
  3. Step 3: Cross multiply
    992.39x = 1,489.94 × 505.78
  4. Step 4: Simplify right side
    992.39x = 753,580.34
  5. Step 5: Solve for x
    x = 753,580.34/992.39
  6. Step 6: Final answer
    x = 759.36

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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.