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Finding the Fourth Proportional to 386,121.70, 579,182.55 and 208,974.70

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Solution

The fourth proportional to 386,121.70, 579,182.55 and 208,974.70 is: 313,462.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,121.70 : 579,182.55 = 208,974.70 : x
  2. Step 2: Convert to fraction form
    386,121.70/579,182.55 = 208,974.70/x
  3. Step 3: Cross multiply
    386,121.70x = 579,182.55 × 208,974.70
  4. Step 4: Simplify right side
    386,121.70x = 121,034,499,631.49
  5. Step 5: Solve for x
    x = 121,034,499,631.49/386,121.70
  6. Step 6: Final answer
    x = 313,462.05

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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.