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Finding the Fourth Proportional to 191,967.40, 287,951.10 and 128,981.80

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Solution

The fourth proportional to 191,967.40, 287,951.10 and 128,981.80 is: 193,472.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,967.40 : 287,951.10 = 128,981.80 : x
  2. Step 2: Convert to fraction form
    191,967.40/287,951.10 = 128,981.80/x
  3. Step 3: Cross multiply
    191,967.40x = 287,951.10 × 128,981.80
  4. Step 4: Simplify right side
    191,967.40x = 37,140,451,189.98
  5. Step 5: Solve for x
    x = 37,140,451,189.98/191,967.40
  6. Step 6: Final answer
    x = 193,472.70

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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.