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Finding the Fourth Proportional to 1,008.38, 1,511.94 and 661.31

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Solution

The fourth proportional to 1,008.38, 1,511.94 and 661.31 is: 991.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.38 : 1,511.94 = 661.31 : x
  2. Step 2: Convert to fraction form
    1,008.38/1,511.94 = 661.31/x
  3. Step 3: Cross multiply
    1,008.38x = 1,511.94 × 661.31
  4. Step 4: Simplify right side
    1,008.38x = 999,861.04
  5. Step 5: Solve for x
    x = 999,861.04/1,008.38
  6. Step 6: Final answer
    x = 991.55

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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.