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Finding the Fourth Proportional to 76,811.20, 115,216.80 and 72,437.20

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Solution

The fourth proportional to 76,811.20, 115,216.80 and 72,437.20 is: 108,655.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,811.20 : 115,216.80 = 72,437.20 : x
  2. Step 2: Convert to fraction form
    76,811.20/115,216.80 = 72,437.20/x
  3. Step 3: Cross multiply
    76,811.20x = 115,216.80 × 72,437.20
  4. Step 4: Simplify right side
    76,811.20x = 8,345,982,384.96
  5. Step 5: Solve for x
    x = 8,345,982,384.96/76,811.20
  6. Step 6: Final answer
    x = 108,655.80

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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.