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Finding the Fourth Proportional to 1,578.29, 2,365.54 and 992.39

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Solution

The fourth proportional to 1,578.29, 2,365.54 and 992.39 is: 1,487.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.29 : 2,365.54 = 992.39 : x
  2. Step 2: Convert to fraction form
    1,578.29/2,365.54 = 992.39/x
  3. Step 3: Cross multiply
    1,578.29x = 2,365.54 × 992.39
  4. Step 4: Simplify right side
    1,578.29x = 2,347,523.93
  5. Step 5: Solve for x
    x = 2,347,523.93/1,578.29
  6. Step 6: Final answer
    x = 1,487.39

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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.