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Finding the Fourth Proportional to 86,520, 119,289.42 and 72,200.46

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Solution

The fourth proportional to 86,520, 119,289.42 and 72,200.46 is: 99,546.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,520 : 119,289.42 = 72,200.46 : x
  2. Step 2: Convert to fraction form
    86,520/119,289.42 = 72,200.46/x
  3. Step 3: Cross multiply
    86,520x = 119,289.42 × 72,200.46
  4. Step 4: Simplify right side
    86,520x = 8,612,750,997.13
  5. Step 5: Solve for x
    x = 8,612,750,997.13/86,520
  6. Step 6: Final answer
    x = 99,546.36

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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.