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Finding the Fourth Proportional to 818.11, 1,128.98 and 445.09

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Solution

The fourth proportional to 818.11, 1,128.98 and 445.09 is: 614.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.11 : 1,128.98 = 445.09 : x
  2. Step 2: Convert to fraction form
    818.11/1,128.98 = 445.09/x
  3. Step 3: Cross multiply
    818.11x = 1,128.98 × 445.09
  4. Step 4: Simplify right side
    818.11x = 502,496.00
  5. Step 5: Solve for x
    x = 502,496.00/818.11
  6. Step 6: Final answer
    x = 614.22

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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.