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Finding the Fourth Proportional to 191,859.40, 288,134.70 and 139,328.20

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Solution

The fourth proportional to 191,859.40, 288,134.70 and 139,328.20 is: 209,243.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,859.40 : 288,134.70 = 139,328.20 : x
  2. Step 2: Convert to fraction form
    191,859.40/288,134.70 = 139,328.20/x
  3. Step 3: Cross multiply
    191,859.40x = 288,134.70 × 139,328.20
  4. Step 4: Simplify right side
    191,859.40x = 40,145,289,108.54
  5. Step 5: Solve for x
    x = 40,145,289,108.54/191,859.40
  6. Step 6: Final answer
    x = 209,243.27

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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.