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Finding the Fourth Proportional to 72,378.87, 108,568.35 and 19,784.40

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Solution

The fourth proportional to 72,378.87, 108,568.35 and 19,784.40 is: 29,676.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,378.87 : 108,568.35 = 19,784.40 : x
  2. Step 2: Convert to fraction form
    72,378.87/108,568.35 = 19,784.40/x
  3. Step 3: Cross multiply
    72,378.87x = 108,568.35 × 19,784.40
  4. Step 4: Simplify right side
    72,378.87x = 2,147,959,293.40
  5. Step 5: Solve for x
    x = 2,147,959,293.40/72,378.87
  6. Step 6: Final answer
    x = 29,676.61

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1.5x scale

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.