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Finding the Fourth Proportional to 661,375.68, 911,853.12 and 428,391.36

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Solution

The fourth proportional to 661,375.68, 911,853.12 and 428,391.36 is: 590,632.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,375.68 : 911,853.12 = 428,391.36 : x
  2. Step 2: Convert to fraction form
    661,375.68/911,853.12 = 428,391.36/x
  3. Step 3: Cross multiply
    661,375.68x = 911,853.12 × 428,391.36
  4. Step 4: Simplify right side
    661,375.68x = 390,629,998,197.04
  5. Step 5: Solve for x
    x = 390,629,998,197.04/661,375.68
  6. Step 6: Final answer
    x = 590,632.54

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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.