Home / 100,725.89-138,998.78-55,403.86

Finding the Fourth Proportional to 100,725.89, 138,998.78 and 55,403.86

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Solution

The fourth proportional to 100,725.89, 138,998.78 and 55,403.86 is: 76,455.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,725.89 : 138,998.78 = 55,403.86 : x
  2. Step 2: Convert to fraction form
    100,725.89/138,998.78 = 55,403.86/x
  3. Step 3: Cross multiply
    100,725.89x = 138,998.78 × 55,403.86
  4. Step 4: Simplify right side
    100,725.89x = 7,701,068,252.30
  5. Step 5: Solve for x
    x = 7,701,068,252.30/100,725.89
  6. Step 6: Final answer
    x = 76,455.70

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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.