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Finding the Fourth Proportional to 191,643, 287,168.78 and 121,374.70

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Solution

The fourth proportional to 191,643, 287,168.78 and 121,374.70 is: 181,874.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,643 : 287,168.78 = 121,374.70 : x
  2. Step 2: Convert to fraction form
    191,643/287,168.78 = 121,374.70/x
  3. Step 3: Cross multiply
    191,643x = 287,168.78 × 121,374.70
  4. Step 4: Simplify right side
    191,643x = 34,855,024,521.87
  5. Step 5: Solve for x
    x = 34,855,024,521.87/191,643
  6. Step 6: Final answer
    x = 181,874.76

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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.