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Finding the Fourth Proportional to 338,863.30, 507,992.92 and 128,648.86

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Solution

The fourth proportional to 338,863.30, 507,992.92 and 128,648.86 is: 192,858.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,863.30 : 507,992.92 = 128,648.86 : x
  2. Step 2: Convert to fraction form
    338,863.30/507,992.92 = 128,648.86/x
  3. Step 3: Cross multiply
    338,863.30x = 507,992.92 × 128,648.86
  4. Step 4: Simplify right side
    338,863.30x = 65,352,708,454.47
  5. Step 5: Solve for x
    x = 65,352,708,454.47/338,863.30
  6. Step 6: Final answer
    x = 192,858.62

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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.