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Finding the Fourth Proportional to 663.36, 989.20 and 617.19

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Solution

The fourth proportional to 663.36, 989.20 and 617.19 is: 920.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.36 : 989.20 = 617.19 : x
  2. Step 2: Convert to fraction form
    663.36/989.20 = 617.19/x
  3. Step 3: Cross multiply
    663.36x = 989.20 × 617.19
  4. Step 4: Simplify right side
    663.36x = 610,522.81
  5. Step 5: Solve for x
    x = 610,522.81/663.36
  6. Step 6: Final answer
    x = 920.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.