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Finding the Fourth Proportional to 191,712.40, 287,565.90 and 86,531.20

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Solution

The fourth proportional to 191,712.40, 287,565.90 and 86,531.20 is: 129,795.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,712.40 : 287,565.90 = 86,531.20 : x
  2. Step 2: Convert to fraction form
    191,712.40/287,565.90 = 86,531.20/x
  3. Step 3: Cross multiply
    191,712.40x = 287,565.90 × 86,531.20
  4. Step 4: Simplify right side
    191,712.40x = 24,883,422,406.08
  5. Step 5: Solve for x
    x = 24,883,422,406.08/191,712.40
  6. Step 6: Final answer
    x = 129,795.58

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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.