Home / 81,211.40-121,817.10-74,990.60

Finding the Fourth Proportional to 81,211.40, 121,817.10 and 74,990.60

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Solution

The fourth proportional to 81,211.40, 121,817.10 and 74,990.60 is: 112,485.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,211.40 : 121,817.10 = 74,990.60 : x
  2. Step 2: Convert to fraction form
    81,211.40/121,817.10 = 74,990.60/x
  3. Step 3: Cross multiply
    81,211.40x = 121,817.10 × 74,990.60
  4. Step 4: Simplify right side
    81,211.40x = 9,135,137,419.26
  5. Step 5: Solve for x
    x = 9,135,137,419.26/81,211.40
  6. Step 6: Final answer
    x = 112,485.90

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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.