Home / 209,186.72-288,682.08-128,659.76

Finding the Fourth Proportional to 209,186.72, 288,682.08 and 128,659.76

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Solution

The fourth proportional to 209,186.72, 288,682.08 and 128,659.76 is: 177,553.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,186.72 : 288,682.08 = 128,659.76 : x
  2. Step 2: Convert to fraction form
    209,186.72/288,682.08 = 128,659.76/x
  3. Step 3: Cross multiply
    209,186.72x = 288,682.08 × 128,659.76
  4. Step 4: Simplify right side
    209,186.72x = 37,141,767,129.10
  5. Step 5: Solve for x
    x = 37,141,767,129.10/209,186.72
  6. Step 6: Final answer
    x = 177,553.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.