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Finding the Fourth Proportional to 76,927.20, 115,390.80 and 66,559.20

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Solution

The fourth proportional to 76,927.20, 115,390.80 and 66,559.20 is: 99,838.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,927.20 : 115,390.80 = 66,559.20 : x
  2. Step 2: Convert to fraction form
    76,927.20/115,390.80 = 66,559.20/x
  3. Step 3: Cross multiply
    76,927.20x = 115,390.80 × 66,559.20
  4. Step 4: Simplify right side
    76,927.20x = 7,680,319,335.36
  5. Step 5: Solve for x
    x = 7,680,319,335.36/76,927.20
  6. Step 6: Final answer
    x = 99,838.80

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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.