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Finding the Fourth Proportional to 1,663.31, 2,295.05 and 999.92

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Solution

The fourth proportional to 1,663.31, 2,295.05 and 999.92 is: 1,379.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,663.31 : 2,295.05 = 999.92 : x
  2. Step 2: Convert to fraction form
    1,663.31/2,295.05 = 999.92/x
  3. Step 3: Cross multiply
    1,663.31x = 2,295.05 × 999.92
  4. Step 4: Simplify right side
    1,663.31x = 2,294,849.92
  5. Step 5: Solve for x
    x = 2,294,849.92/1,663.31
  6. Step 6: Final answer
    x = 1,379.69

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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.