Home / 81,421.70-122,320.27-78,058.71

Finding the Fourth Proportional to 81,421.70, 122,320.27 and 78,058.71

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Solution

The fourth proportional to 81,421.70, 122,320.27 and 78,058.71 is: 117,268.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,421.70 : 122,320.27 = 78,058.71 : x
  2. Step 2: Convert to fraction form
    81,421.70/122,320.27 = 78,058.71/x
  3. Step 3: Cross multiply
    81,421.70x = 122,320.27 × 78,058.71
  4. Step 4: Simplify right side
    81,421.70x = 9,548,162,398.56
  5. Step 5: Solve for x
    x = 9,548,162,398.56/81,421.70
  6. Step 6: Final answer
    x = 117,268.03

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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.