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Finding the Fourth Proportional to 76,679.20, 115,018.80 and 21,275.20

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Solution

The fourth proportional to 76,679.20, 115,018.80 and 21,275.20 is: 31,912.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,679.20 : 115,018.80 = 21,275.20 : x
  2. Step 2: Convert to fraction form
    76,679.20/115,018.80 = 21,275.20/x
  3. Step 3: Cross multiply
    76,679.20x = 115,018.80 × 21,275.20
  4. Step 4: Simplify right side
    76,679.20x = 2,447,047,973.76
  5. Step 5: Solve for x
    x = 2,447,047,973.76/76,679.20
  6. Step 6: Final answer
    x = 31,912.80

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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.