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Finding the Fourth Proportional to 818.05, 1,128.91 and 445.03

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Solution

The fourth proportional to 818.05, 1,128.91 and 445.03 is: 614.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.05 : 1,128.91 = 445.03 : x
  2. Step 2: Convert to fraction form
    818.05/1,128.91 = 445.03/x
  3. Step 3: Cross multiply
    818.05x = 1,128.91 × 445.03
  4. Step 4: Simplify right side
    818.05x = 502,402.07
  5. Step 5: Solve for x
    x = 502,402.07/818.05
  6. Step 6: Final answer
    x = 614.15

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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.