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Finding the Fourth Proportional to 996.84, 1,374.20 and 660.18

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Solution

The fourth proportional to 996.84, 1,374.20 and 660.18 is: 910.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.84 : 1,374.20 = 660.18 : x
  2. Step 2: Convert to fraction form
    996.84/1,374.20 = 660.18/x
  3. Step 3: Cross multiply
    996.84x = 1,374.20 × 660.18
  4. Step 4: Simplify right side
    996.84x = 907,214.72
  5. Step 5: Solve for x
    x = 907,214.72/996.84
  6. Step 6: Final answer
    x = 910.09

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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.