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Finding the Fourth Proportional to 155,919, 215,189.28 and 87,949.92

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Solution

The fourth proportional to 155,919, 215,189.28 and 87,949.92 is: 121,382.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,919 : 215,189.28 = 87,949.92 : x
  2. Step 2: Convert to fraction form
    155,919/215,189.28 = 87,949.92/x
  3. Step 3: Cross multiply
    155,919x = 215,189.28 × 87,949.92
  4. Step 4: Simplify right side
    155,919x = 18,925,879,960.86
  5. Step 5: Solve for x
    x = 18,925,879,960.86/155,919
  6. Step 6: Final answer
    x = 121,382.77

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1.5x scale

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.