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Finding the Fourth Proportional to 990.44, 1,366.38 and 617.16

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Solution

The fourth proportional to 990.44, 1,366.38 and 617.16 is: 851.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.44 : 1,366.38 = 617.16 : x
  2. Step 2: Convert to fraction form
    990.44/1,366.38 = 617.16/x
  3. Step 3: Cross multiply
    990.44x = 1,366.38 × 617.16
  4. Step 4: Simplify right side
    990.44x = 843,275.08
  5. Step 5: Solve for x
    x = 843,275.08/990.44
  6. Step 6: Final answer
    x = 851.41

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Double scale
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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.