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Finding the Fourth Proportional to 191,490.64, 287,367.17 and 66,831.64

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Solution

The fourth proportional to 191,490.64, 287,367.17 and 66,831.64 is: 100,293.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,490.64 : 287,367.17 = 66,831.64 : x
  2. Step 2: Convert to fraction form
    191,490.64/287,367.17 = 66,831.64/x
  3. Step 3: Cross multiply
    191,490.64x = 287,367.17 × 66,831.64
  4. Step 4: Simplify right side
    191,490.64x = 19,205,218,919.10
  5. Step 5: Solve for x
    x = 19,205,218,919.10/191,490.64
  6. Step 6: Final answer
    x = 100,293.25

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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.