Home / 81,139.20-121,619.70-28,521.60

Finding the Fourth Proportional to 81,139.20, 121,619.70 and 28,521.60

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Solution

The fourth proportional to 81,139.20, 121,619.70 and 28,521.60 is: 42,751.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,139.20 : 121,619.70 = 28,521.60 : x
  2. Step 2: Convert to fraction form
    81,139.20/121,619.70 = 28,521.60/x
  3. Step 3: Cross multiply
    81,139.20x = 121,619.70 × 28,521.60
  4. Step 4: Simplify right side
    81,139.20x = 3,468,788,435.52
  5. Step 5: Solve for x
    x = 3,468,788,435.52/81,139.20
  6. Step 6: Final answer
    x = 42,751.08

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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.