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Finding the Fourth Proportional to 77,065.60, 115,425.60 and 66,697.60

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Solution

The fourth proportional to 77,065.60, 115,425.60 and 66,697.60 is: 99,896.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,065.60 : 115,425.60 = 66,697.60 : x
  2. Step 2: Convert to fraction form
    77,065.60/115,425.60 = 66,697.60/x
  3. Step 3: Cross multiply
    77,065.60x = 115,425.60 × 66,697.60
  4. Step 4: Simplify right side
    77,065.60x = 7,698,610,498.56
  5. Step 5: Solve for x
    x = 7,698,610,498.56/77,065.60
  6. Step 6: Final answer
    x = 99,896.85

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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.