Home / 129,039.40-193,559.10-81,800.20

Finding the Fourth Proportional to 129,039.40, 193,559.10 and 81,800.20

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Solution

The fourth proportional to 129,039.40, 193,559.10 and 81,800.20 is: 122,700.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,039.40 : 193,559.10 = 81,800.20 : x
  2. Step 2: Convert to fraction form
    129,039.40/193,559.10 = 81,800.20/x
  3. Step 3: Cross multiply
    129,039.40x = 193,559.10 × 81,800.20
  4. Step 4: Simplify right side
    129,039.40x = 15,833,173,091.82
  5. Step 5: Solve for x
    x = 15,833,173,091.82/129,039.40
  6. Step 6: Final answer
    x = 122,700.30

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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.