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Finding the Fourth Proportional to 170,811.20, 256,216.80 and 72,507.20

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Solution

The fourth proportional to 170,811.20, 256,216.80 and 72,507.20 is: 108,760.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,811.20 : 256,216.80 = 72,507.20 : x
  2. Step 2: Convert to fraction form
    170,811.20/256,216.80 = 72,507.20/x
  3. Step 3: Cross multiply
    170,811.20x = 256,216.80 × 72,507.20
  4. Step 4: Simplify right side
    170,811.20x = 18,577,562,760.96
  5. Step 5: Solve for x
    x = 18,577,562,760.96/170,811.20
  6. Step 6: Final answer
    x = 108,760.80

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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.