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Finding the Fourth Proportional to 990.19, 1,366.61 and 617.29

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Solution

The fourth proportional to 990.19, 1,366.61 and 617.29 is: 851.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.19 : 1,366.61 = 617.29 : x
  2. Step 2: Convert to fraction form
    990.19/1,366.61 = 617.29/x
  3. Step 3: Cross multiply
    990.19x = 1,366.61 × 617.29
  4. Step 4: Simplify right side
    990.19x = 843,588.18
  5. Step 5: Solve for x
    x = 843,588.18/990.19
  6. Step 6: Final answer
    x = 851.94

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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.