Home / 205,979.46-309,018.51-85,969.68

Finding the Fourth Proportional to 205,979.46, 309,018.51 and 85,969.68

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Solution

The fourth proportional to 205,979.46, 309,018.51 and 85,969.68 is: 128,975.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,979.46 : 309,018.51 = 85,969.68 : x
  2. Step 2: Convert to fraction form
    205,979.46/309,018.51 = 85,969.68/x
  3. Step 3: Cross multiply
    205,979.46x = 309,018.51 × 85,969.68
  4. Step 4: Simplify right side
    205,979.46x = 26,566,222,418.78
  5. Step 5: Solve for x
    x = 26,566,222,418.78/205,979.46
  6. Step 6: Final answer
    x = 128,975.10

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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.