Home / 128,811.40-193,313.10-66,449.80

Finding the Fourth Proportional to 128,811.40, 193,313.10 and 66,449.80

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Solution

The fourth proportional to 128,811.40, 193,313.10 and 66,449.80 is: 99,724.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,811.40 : 193,313.10 = 66,449.80 : x
  2. Step 2: Convert to fraction form
    128,811.40/193,313.10 = 66,449.80/x
  3. Step 3: Cross multiply
    128,811.40x = 193,313.10 × 66,449.80
  4. Step 4: Simplify right side
    128,811.40x = 12,845,616,832.38
  5. Step 5: Solve for x
    x = 12,845,616,832.38/128,811.40
  6. Step 6: Final answer
    x = 99,724.22

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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.