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Finding the Fourth Proportional to 191,690.40, 287,319.60 and 91,898.40

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Solution

The fourth proportional to 191,690.40, 287,319.60 and 91,898.40 is: 137,744.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,690.40 : 287,319.60 = 91,898.40 : x
  2. Step 2: Convert to fraction form
    191,690.40/287,319.60 = 91,898.40/x
  3. Step 3: Cross multiply
    191,690.40x = 287,319.60 × 91,898.40
  4. Step 4: Simplify right side
    191,690.40x = 26,404,211,528.64
  5. Step 5: Solve for x
    x = 26,404,211,528.64/191,690.40
  6. Step 6: Final answer
    x = 137,744.05

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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.