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Finding the Fourth Proportional to 990.56, 1,364.16 and 769.12

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Solution

The fourth proportional to 990.56, 1,364.16 and 769.12 is: 1,059.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.56 : 1,364.16 = 769.12 : x
  2. Step 2: Convert to fraction form
    990.56/1,364.16 = 769.12/x
  3. Step 3: Cross multiply
    990.56x = 1,364.16 × 769.12
  4. Step 4: Simplify right side
    990.56x = 1,049,202.74
  5. Step 5: Solve for x
    x = 1,049,202.74/990.56
  6. Step 6: Final answer
    x = 1,059.20

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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.