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Finding the Fourth Proportional to 990.46, 1,366.26 and 641.15

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Solution

The fourth proportional to 990.46, 1,366.26 and 641.15 is: 884.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.46 : 1,366.26 = 641.15 : x
  2. Step 2: Convert to fraction form
    990.46/1,366.26 = 641.15/x
  3. Step 3: Cross multiply
    990.46x = 1,366.26 × 641.15
  4. Step 4: Simplify right side
    990.46x = 875,977.60
  5. Step 5: Solve for x
    x = 875,977.60/990.46
  6. Step 6: Final answer
    x = 884.41

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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.