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Finding the Fourth Proportional to 191,718.90, 287,575.65 and 86,537.70

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Solution

The fourth proportional to 191,718.90, 287,575.65 and 86,537.70 is: 129,805.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,718.90 : 287,575.65 = 86,537.70 : x
  2. Step 2: Convert to fraction form
    191,718.90/287,575.65 = 86,537.70/x
  3. Step 3: Cross multiply
    191,718.90x = 287,575.65 × 86,537.70
  4. Step 4: Simplify right side
    191,718.90x = 24,886,135,327.01
  5. Step 5: Solve for x
    x = 24,886,135,327.01/191,718.90
  6. Step 6: Final answer
    x = 129,805.33

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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.