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Finding the Fourth Proportional to 191,618.51, 287,550.78 and 128,509.90

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Solution

The fourth proportional to 191,618.51, 287,550.78 and 128,509.90 is: 192,847.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,618.51 : 287,550.78 = 128,509.90 : x
  2. Step 2: Convert to fraction form
    191,618.51/287,550.78 = 128,509.90/x
  3. Step 3: Cross multiply
    191,618.51x = 287,550.78 × 128,509.90
  4. Step 4: Simplify right side
    191,618.51x = 36,953,121,982.72
  5. Step 5: Solve for x
    x = 36,953,121,982.72/191,618.51
  6. Step 6: Final answer
    x = 192,847.35

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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.