Home / 205,984.70-309,159.30-121,639.40

Finding the Fourth Proportional to 205,984.70, 309,159.30 and 121,639.40

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Solution

The fourth proportional to 205,984.70, 309,159.30 and 121,639.40 is: 182,566.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,984.70 : 309,159.30 = 121,639.40 : x
  2. Step 2: Convert to fraction form
    205,984.70/309,159.30 = 121,639.40/x
  3. Step 3: Cross multiply
    205,984.70x = 309,159.30 × 121,639.40
  4. Step 4: Simplify right side
    205,984.70x = 37,605,951,756.42
  5. Step 5: Solve for x
    x = 37,605,951,756.42/205,984.70
  6. Step 6: Final answer
    x = 182,566.72

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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.