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Finding the Fourth Proportional to 191,911.40, 287,780.70 and 86,676.20

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Solution

The fourth proportional to 191,911.40, 287,780.70 and 86,676.20 is: 129,975.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,911.40 : 287,780.70 = 86,676.20 : x
  2. Step 2: Convert to fraction form
    191,911.40/287,780.70 = 86,676.20/x
  3. Step 3: Cross multiply
    191,911.40x = 287,780.70 × 86,676.20
  4. Step 4: Simplify right side
    191,911.40x = 24,943,737,509.34
  5. Step 5: Solve for x
    x = 24,943,737,509.34/191,911.40
  6. Step 6: Final answer
    x = 129,975.28

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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.