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Finding the Fourth Proportional to 78,797.62, 108,739.69 and 42,986.87

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Solution

The fourth proportional to 78,797.62, 108,739.69 and 42,986.87 is: 59,321.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,797.62 : 108,739.69 = 42,986.87 : x
  2. Step 2: Convert to fraction form
    78,797.62/108,739.69 = 42,986.87/x
  3. Step 3: Cross multiply
    78,797.62x = 108,739.69 × 42,986.87
  4. Step 4: Simplify right side
    78,797.62x = 4,674,378,917.87
  5. Step 5: Solve for x
    x = 4,674,378,917.87/78,797.62
  6. Step 6: Final answer
    x = 59,321.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.