Home / 81,406.20-122,109.30-71,564.70

Finding the Fourth Proportional to 81,406.20, 122,109.30 and 71,564.70

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Solution

The fourth proportional to 81,406.20, 122,109.30 and 71,564.70 is: 107,347.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,406.20 : 122,109.30 = 71,564.70 : x
  2. Step 2: Convert to fraction form
    81,406.20/122,109.30 = 71,564.70/x
  3. Step 3: Cross multiply
    81,406.20x = 122,109.30 × 71,564.70
  4. Step 4: Simplify right side
    81,406.20x = 8,738,715,421.71
  5. Step 5: Solve for x
    x = 8,738,715,421.71/81,406.20
  6. Step 6: Final answer
    x = 107,347.05

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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.