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Finding the Fourth Proportional to 223,613.92, 308,595.21 and 128,139.05

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Solution

The fourth proportional to 223,613.92, 308,595.21 and 128,139.05 is: 176,836.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    223,613.92 : 308,595.21 = 128,139.05 : x
  2. Step 2: Convert to fraction form
    223,613.92/308,595.21 = 128,139.05/x
  3. Step 3: Cross multiply
    223,613.92x = 308,595.21 × 128,139.05
  4. Step 4: Simplify right side
    223,613.92x = 39,543,097,043.95
  5. Step 5: Solve for x
    x = 39,543,097,043.95/223,613.92
  6. Step 6: Final answer
    x = 176,836.47

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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.