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Finding the Fourth Proportional to 223,568.79, 308,568.74 and 128,139.45

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Solution

The fourth proportional to 223,568.79, 308,568.74 and 128,139.45 is: 176,857.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    223,568.79 : 308,568.74 = 128,139.45 : x
  2. Step 2: Convert to fraction form
    223,568.79/308,568.74 = 128,139.45/x
  3. Step 3: Cross multiply
    223,568.79x = 308,568.74 × 128,139.45
  4. Step 4: Simplify right side
    223,568.79x = 39,539,827,990.10
  5. Step 5: Solve for x
    x = 39,539,827,990.10/223,568.79
  6. Step 6: Final answer
    x = 176,857.55

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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.