Home / 81,211.20-121,816.80-76,705.60

Finding the Fourth Proportional to 81,211.20, 121,816.80 and 76,705.60

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Solution

The fourth proportional to 81,211.20, 121,816.80 and 76,705.60 is: 115,058.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,211.20 : 121,816.80 = 76,705.60 : x
  2. Step 2: Convert to fraction form
    81,211.20/121,816.80 = 76,705.60/x
  3. Step 3: Cross multiply
    81,211.20x = 121,816.80 × 76,705.60
  4. Step 4: Simplify right side
    81,211.20x = 9,344,030,734.08
  5. Step 5: Solve for x
    x = 9,344,030,734.08/81,211.20
  6. Step 6: Final answer
    x = 115,058.40

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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.