Home / 81,106.20-121,586.40-51,508.80

Finding the Fourth Proportional to 81,106.20, 121,586.40 and 51,508.80

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Solution

The fourth proportional to 81,106.20, 121,586.40 and 51,508.80 is: 77,216.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,106.20 : 121,586.40 = 51,508.80 : x
  2. Step 2: Convert to fraction form
    81,106.20/121,586.40 = 51,508.80/x
  3. Step 3: Cross multiply
    81,106.20x = 121,586.40 × 51,508.80
  4. Step 4: Simplify right side
    81,106.20x = 6,262,769,560.32
  5. Step 5: Solve for x
    x = 6,262,769,560.32/81,106.20
  6. Step 6: Final answer
    x = 77,216.90

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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.