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Finding the Fourth Proportional to 661,197.48, 991,717.38 and 391,486.92

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Solution

The fourth proportional to 661,197.48, 991,717.38 and 391,486.92 is: 587,183.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,197.48 : 991,717.38 = 391,486.92 : x
  2. Step 2: Convert to fraction form
    661,197.48/991,717.38 = 391,486.92/x
  3. Step 3: Cross multiply
    661,197.48x = 991,717.38 × 391,486.92
  4. Step 4: Simplify right side
    661,197.48x = 388,244,382,606.67
  5. Step 5: Solve for x
    x = 388,244,382,606.67/661,197.48
  6. Step 6: Final answer
    x = 587,183.70

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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.