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Finding the Fourth Proportional to 191,423.21, 287,134.90 and 78,979.84

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Solution

The fourth proportional to 191,423.21, 287,134.90 and 78,979.84 is: 118,469.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,423.21 : 287,134.90 = 78,979.84 : x
  2. Step 2: Convert to fraction form
    191,423.21/287,134.90 = 78,979.84/x
  3. Step 3: Cross multiply
    191,423.21x = 287,134.90 × 78,979.84
  4. Step 4: Simplify right side
    191,423.21x = 22,677,869,026.62
  5. Step 5: Solve for x
    x = 22,677,869,026.62/191,423.21
  6. Step 6: Final answer
    x = 118,469.80

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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.