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Finding the Fourth Proportional to 990.55, 1,366.25 and 612.43

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Solution

The fourth proportional to 990.55, 1,366.25 and 612.43 is: 844.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.55 : 1,366.25 = 612.43 : x
  2. Step 2: Convert to fraction form
    990.55/1,366.25 = 612.43/x
  3. Step 3: Cross multiply
    990.55x = 1,366.25 × 612.43
  4. Step 4: Simplify right side
    990.55x = 836,732.49
  5. Step 5: Solve for x
    x = 836,732.49/990.55
  6. Step 6: Final answer
    x = 844.72

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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.