Home / 205,985.30-308,977.95-81,310.10

Finding the Fourth Proportional to 205,985.30, 308,977.95 and 81,310.10

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Solution

The fourth proportional to 205,985.30, 308,977.95 and 81,310.10 is: 121,965.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,985.30 : 308,977.95 = 81,310.10 : x
  2. Step 2: Convert to fraction form
    205,985.30/308,977.95 = 81,310.10/x
  3. Step 3: Cross multiply
    205,985.30x = 308,977.95 × 81,310.10
  4. Step 4: Simplify right side
    205,985.30x = 25,123,028,012.30
  5. Step 5: Solve for x
    x = 25,123,028,012.30/205,985.30
  6. Step 6: Final answer
    x = 121,965.15

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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.