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Finding the Fourth Proportional to 191,238.78, 286,859.34 and 66,579.78

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Solution

The fourth proportional to 191,238.78, 286,859.34 and 66,579.78 is: 99,870.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,238.78 : 286,859.34 = 66,579.78 : x
  2. Step 2: Convert to fraction form
    191,238.78/286,859.34 = 66,579.78/x
  3. Step 3: Cross multiply
    191,238.78x = 286,859.34 × 66,579.78
  4. Step 4: Simplify right side
    191,238.78x = 19,099,031,748.15
  5. Step 5: Solve for x
    x = 19,099,031,748.15/191,238.78
  6. Step 6: Final answer
    x = 99,870.08

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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.