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Finding the Fourth Proportional to 663.90, 991.24 and 559.10

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Solution

The fourth proportional to 663.90, 991.24 and 559.10 is: 834.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.90 : 991.24 = 559.10 : x
  2. Step 2: Convert to fraction form
    663.90/991.24 = 559.10/x
  3. Step 3: Cross multiply
    663.90x = 991.24 × 559.10
  4. Step 4: Simplify right side
    663.90x = 554,203.36
  5. Step 5: Solve for x
    x = 554,203.36/663.90
  6. Step 6: Final answer
    x = 834.77

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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.