Home / 81,211.40-121,817.10-72,302.60

Finding the Fourth Proportional to 81,211.40, 121,817.10 and 72,302.60

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Solution

The fourth proportional to 81,211.40, 121,817.10 and 72,302.60 is: 108,453.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,211.40 : 121,817.10 = 72,302.60 : x
  2. Step 2: Convert to fraction form
    81,211.40/121,817.10 = 72,302.60/x
  3. Step 3: Cross multiply
    81,211.40x = 121,817.10 × 72,302.60
  4. Step 4: Simplify right side
    81,211.40x = 8,807,693,054.46
  5. Step 5: Solve for x
    x = 8,807,693,054.46/81,211.40
  6. Step 6: Final answer
    x = 108,453.90

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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.