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Finding the Fourth Proportional to 191,811.80, 287,717.70 and 86,835.80

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Solution

The fourth proportional to 191,811.80, 287,717.70 and 86,835.80 is: 130,253.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,811.80 : 287,717.70 = 86,835.80 : x
  2. Step 2: Convert to fraction form
    191,811.80/287,717.70 = 86,835.80/x
  3. Step 3: Cross multiply
    191,811.80x = 287,717.70 × 86,835.80
  4. Step 4: Simplify right side
    191,811.80x = 24,984,196,653.66
  5. Step 5: Solve for x
    x = 24,984,196,653.66/191,811.80
  6. Step 6: Final answer
    x = 130,253.70

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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.