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Finding the Fourth Proportional to 191,105.40, 286,571.70 and 85,870.20

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Solution

The fourth proportional to 191,105.40, 286,571.70 and 85,870.20 is: 128,766.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,105.40 : 286,571.70 = 85,870.20 : x
  2. Step 2: Convert to fraction form
    191,105.40/286,571.70 = 85,870.20/x
  3. Step 3: Cross multiply
    191,105.40x = 286,571.70 × 85,870.20
  4. Step 4: Simplify right side
    191,105.40x = 24,607,969,193.34
  5. Step 5: Solve for x
    x = 24,607,969,193.34/191,105.40
  6. Step 6: Final answer
    x = 128,766.48

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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.