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Finding the Fourth Proportional to 57,057.60, 78,759.28 and 39,211.68

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Solution

The fourth proportional to 57,057.60, 78,759.28 and 39,211.68 is: 54,125.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,057.60 : 78,759.28 = 39,211.68 : x
  2. Step 2: Convert to fraction form
    57,057.60/78,759.28 = 39,211.68/x
  3. Step 3: Cross multiply
    57,057.60x = 78,759.28 × 39,211.68
  4. Step 4: Simplify right side
    57,057.60x = 3,088,283,684.39
  5. Step 5: Solve for x
    x = 3,088,283,684.39/57,057.60
  6. Step 6: Final answer
    x = 54,125.72

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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.