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Finding the Fourth Proportional to 86,865, 130,076.97 and 72,788.01

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Solution

The fourth proportional to 86,865, 130,076.97 and 72,788.01 is: 108,997.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,865 : 130,076.97 = 72,788.01 : x
  2. Step 2: Convert to fraction form
    86,865/130,076.97 = 72,788.01/x
  3. Step 3: Cross multiply
    86,865x = 130,076.97 × 72,788.01
  4. Step 4: Simplify right side
    86,865x = 9,468,043,793.13
  5. Step 5: Solve for x
    x = 9,468,043,793.13/86,865
  6. Step 6: Final answer
    x = 108,997.22

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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.