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Finding the Fourth Proportional to 491,121, 677,644.92 and 287,131.92

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Solution

The fourth proportional to 491,121, 677,644.92 and 287,131.92 is: 396,182.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,121 : 677,644.92 = 287,131.92 : x
  2. Step 2: Convert to fraction form
    491,121/677,644.92 = 287,131.92/x
  3. Step 3: Cross multiply
    491,121x = 677,644.92 × 287,131.92
  4. Step 4: Simplify right side
    491,121x = 194,573,484,416.68
  5. Step 5: Solve for x
    x = 194,573,484,416.68/491,121
  6. Step 6: Final answer
    x = 396,182.38

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1.5x scale

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.