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Finding the Fourth Proportional to 114,911.70, 172,367.55 and 85,387.20

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Solution

The fourth proportional to 114,911.70, 172,367.55 and 85,387.20 is: 128,080.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    114,911.70 : 172,367.55 = 85,387.20 : x
  2. Step 2: Convert to fraction form
    114,911.70/172,367.55 = 85,387.20/x
  3. Step 3: Cross multiply
    114,911.70x = 172,367.55 × 85,387.20
  4. Step 4: Simplify right side
    114,911.70x = 14,717,982,465.36
  5. Step 5: Solve for x
    x = 14,717,982,465.36/114,911.70
  6. Step 6: Final answer
    x = 128,080.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.