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Finding the Fourth Proportional to 280,885.71, 387,622.21 and 153,561.30

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Solution

The fourth proportional to 280,885.71, 387,622.21 and 153,561.30 is: 211,914.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,885.71 : 387,622.21 = 153,561.30 : x
  2. Step 2: Convert to fraction form
    280,885.71/387,622.21 = 153,561.30/x
  3. Step 3: Cross multiply
    280,885.71x = 387,622.21 × 153,561.30
  4. Step 4: Simplify right side
    280,885.71x = 59,523,770,476.47
  5. Step 5: Solve for x
    x = 59,523,770,476.47/280,885.71
  6. Step 6: Final answer
    x = 211,914.56

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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.