Home / 205,830.30-308,745.45-81,155.10

Finding the Fourth Proportional to 205,830.30, 308,745.45 and 81,155.10

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Solution

The fourth proportional to 205,830.30, 308,745.45 and 81,155.10 is: 121,732.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,830.30 : 308,745.45 = 81,155.10 : x
  2. Step 2: Convert to fraction form
    205,830.30/308,745.45 = 81,155.10/x
  3. Step 3: Cross multiply
    205,830.30x = 308,745.45 × 81,155.10
  4. Step 4: Simplify right side
    205,830.30x = 25,056,267,869.30
  5. Step 5: Solve for x
    x = 25,056,267,869.30/205,830.30
  6. Step 6: Final answer
    x = 121,732.65

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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.