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Finding the Fourth Proportional to 71,278.50, 98,405.09 and 53,228.46

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Solution

The fourth proportional to 71,278.50, 98,405.09 and 53,228.46 is: 73,485.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,278.50 : 98,405.09 = 53,228.46 : x
  2. Step 2: Convert to fraction form
    71,278.50/98,405.09 = 53,228.46/x
  3. Step 3: Cross multiply
    71,278.50x = 98,405.09 × 53,228.46
  4. Step 4: Simplify right side
    71,278.50x = 5,237,951,396.86
  5. Step 5: Solve for x
    x = 5,237,951,396.86/71,278.50
  6. Step 6: Final answer
    x = 73,485.71

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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.