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Finding the Fourth Proportional to 279,879.59, 385,928.61 and 189,077.90

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Solution

The fourth proportional to 279,879.59, 385,928.61 and 189,077.90 is: 260,721.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,879.59 : 385,928.61 = 189,077.90 : x
  2. Step 2: Convert to fraction form
    279,879.59/385,928.61 = 189,077.90/x
  3. Step 3: Cross multiply
    279,879.59x = 385,928.61 × 189,077.90
  4. Step 4: Simplify right side
    279,879.59x = 72,970,569,021.82
  5. Step 5: Solve for x
    x = 72,970,569,021.82/279,879.59
  6. Step 6: Final answer
    x = 260,721.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.