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Finding the Fourth Proportional to 890.99, 1,229.58 and 559.43

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Solution

The fourth proportional to 890.99, 1,229.58 and 559.43 is: 772.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.99 : 1,229.58 = 559.43 : x
  2. Step 2: Convert to fraction form
    890.99/1,229.58 = 559.43/x
  3. Step 3: Cross multiply
    890.99x = 1,229.58 × 559.43
  4. Step 4: Simplify right side
    890.99x = 687,857.79
  5. Step 5: Solve for x
    x = 687,857.79/890.99
  6. Step 6: Final answer
    x = 772.02

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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.