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Finding the Fourth Proportional to 138,163.62, 190,665.82 and 78,547.62

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Solution

The fourth proportional to 138,163.62, 190,665.82 and 78,547.62 is: 108,395.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,163.62 : 190,665.82 = 78,547.62 : x
  2. Step 2: Convert to fraction form
    138,163.62/190,665.82 = 78,547.62/x
  3. Step 3: Cross multiply
    138,163.62x = 190,665.82 × 78,547.62
  4. Step 4: Simplify right side
    138,163.62x = 14,976,346,376.35
  5. Step 5: Solve for x
    x = 14,976,346,376.35/138,163.62
  6. Step 6: Final answer
    x = 108,395.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.