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Finding the Fourth Proportional to 191,613, 287,542.52 and 128,504.40

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Solution

The fourth proportional to 191,613, 287,542.52 and 128,504.40 is: 192,839.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,613 : 287,542.52 = 128,504.40 : x
  2. Step 2: Convert to fraction form
    191,613/287,542.52 = 128,504.40/x
  3. Step 3: Cross multiply
    191,613x = 287,542.52 × 128,504.40
  4. Step 4: Simplify right side
    191,613x = 36,950,479,007.09
  5. Step 5: Solve for x
    x = 36,950,479,007.09/191,613
  6. Step 6: Final answer
    x = 192,839.10

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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.