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Finding the Fourth Proportional to 191,490.38, 287,366.78 and 66,831.38

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Solution

The fourth proportional to 191,490.38, 287,366.78 and 66,831.38 is: 100,292.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,490.38 : 287,366.78 = 66,831.38 : x
  2. Step 2: Convert to fraction form
    191,490.38/287,366.78 = 66,831.38/x
  3. Step 3: Cross multiply
    191,490.38x = 287,366.78 × 66,831.38
  4. Step 4: Simplify right side
    191,490.38x = 19,205,118,473.56
  5. Step 5: Solve for x
    x = 19,205,118,473.56/191,490.38
  6. Step 6: Final answer
    x = 100,292.86

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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.