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Finding the Fourth Proportional to 661,188.48, 991,703.88 and 391,477.92

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Solution

The fourth proportional to 661,188.48, 991,703.88 and 391,477.92 is: 587,170.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,188.48 : 991,703.88 = 391,477.92 : x
  2. Step 2: Convert to fraction form
    661,188.48/991,703.88 = 391,477.92/x
  3. Step 3: Cross multiply
    661,188.48x = 991,703.88 × 391,477.92
  4. Step 4: Simplify right side
    661,188.48x = 388,230,172,198.33
  5. Step 5: Solve for x
    x = 388,230,172,198.33/661,188.48
  6. Step 6: Final answer
    x = 587,170.20

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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.