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Finding the Fourth Proportional to 191,528.40, 287,422.20 and 86,293.20

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Solution

The fourth proportional to 191,528.40, 287,422.20 and 86,293.20 is: 129,498.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,528.40 : 287,422.20 = 86,293.20 : x
  2. Step 2: Convert to fraction form
    191,528.40/287,422.20 = 86,293.20/x
  3. Step 3: Cross multiply
    191,528.40x = 287,422.20 × 86,293.20
  4. Step 4: Simplify right side
    191,528.40x = 24,802,581,389.04
  5. Step 5: Solve for x
    x = 24,802,581,389.04/191,528.40
  6. Step 6: Final answer
    x = 129,498.19

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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.