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Finding the Fourth Proportional to 664,915.40, 995,969.10 and 440,383.40

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Solution

The fourth proportional to 664,915.40, 995,969.10 and 440,383.40 is: 659,645.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,915.40 : 995,969.10 = 440,383.40 : x
  2. Step 2: Convert to fraction form
    664,915.40/995,969.10 = 440,383.40/x
  3. Step 3: Cross multiply
    664,915.40x = 995,969.10 × 440,383.40
  4. Step 4: Simplify right side
    664,915.40x = 438,608,258,552.94
  5. Step 5: Solve for x
    x = 438,608,258,552.94/664,915.40
  6. Step 6: Final answer
    x = 659,645.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.