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Finding the Fourth Proportional to 111,285.59, 153,783.68 and 84,378.20

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Solution

The fourth proportional to 111,285.59, 153,783.68 and 84,378.20 is: 116,600.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,285.59 : 153,783.68 = 84,378.20 : x
  2. Step 2: Convert to fraction form
    111,285.59/153,783.68 = 84,378.20/x
  3. Step 3: Cross multiply
    111,285.59x = 153,783.68 × 84,378.20
  4. Step 4: Simplify right side
    111,285.59x = 12,975,988,916.97
  5. Step 5: Solve for x
    x = 12,975,988,916.97/111,285.59
  6. Step 6: Final answer
    x = 116,600.81

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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.