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Finding the Fourth Proportional to 1,009.94, 1,515.55 and 663.97

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Solution

The fourth proportional to 1,009.94, 1,515.55 and 663.97 is: 996.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.94 : 1,515.55 = 663.97 : x
  2. Step 2: Convert to fraction form
    1,009.94/1,515.55 = 663.97/x
  3. Step 3: Cross multiply
    1,009.94x = 1,515.55 × 663.97
  4. Step 4: Simplify right side
    1,009.94x = 1,006,272.16
  5. Step 5: Solve for x
    x = 1,006,272.16/1,009.94
  6. Step 6: Final answer
    x = 996.37

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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.