Home / 128,268.45-192,402.68-86,278.05

Finding the Fourth Proportional to 128,268.45, 192,402.68 and 86,278.05

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Solution

The fourth proportional to 128,268.45, 192,402.68 and 86,278.05 is: 129,417.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,268.45 : 192,402.68 = 86,278.05 : x
  2. Step 2: Convert to fraction form
    128,268.45/192,402.68 = 86,278.05/x
  3. Step 3: Cross multiply
    128,268.45x = 192,402.68 × 86,278.05
  4. Step 4: Simplify right side
    128,268.45x = 16,600,127,613.78
  5. Step 5: Solve for x
    x = 16,600,127,613.78/128,268.45
  6. Step 6: Final answer
    x = 129,417.08

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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.