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Finding the Fourth Proportional to 86,057.60, 128,976.44 and 69,425.47

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Solution

The fourth proportional to 86,057.60, 128,976.44 and 69,425.47 is: 104,049.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,057.60 : 128,976.44 = 69,425.47 : x
  2. Step 2: Convert to fraction form
    86,057.60/128,976.44 = 69,425.47/x
  3. Step 3: Cross multiply
    86,057.60x = 128,976.44 × 69,425.47
  4. Step 4: Simplify right side
    86,057.60x = 8,954,249,494.61
  5. Step 5: Solve for x
    x = 8,954,249,494.61/86,057.60
  6. Step 6: Final answer
    x = 104,049.49

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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.