Home / 81,020.20-121,559.10-78,140.20

Finding the Fourth Proportional to 81,020.20, 121,559.10 and 78,140.20

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Solution

The fourth proportional to 81,020.20, 121,559.10 and 78,140.20 is: 117,238.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,020.20 : 121,559.10 = 78,140.20 : x
  2. Step 2: Convert to fraction form
    81,020.20/121,559.10 = 78,140.20/x
  3. Step 3: Cross multiply
    81,020.20x = 121,559.10 × 78,140.20
  4. Step 4: Simplify right side
    81,020.20x = 9,498,652,385.82
  5. Step 5: Solve for x
    x = 9,498,652,385.82/81,020.20
  6. Step 6: Final answer
    x = 117,238.08

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1.5x scale

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.