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Finding the Fourth Proportional to 138,375.77, 190,870.77 and 87,299.28

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Solution

The fourth proportional to 138,375.77, 190,870.77 and 87,299.28 is: 120,417.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,375.77 : 190,870.77 = 87,299.28 : x
  2. Step 2: Convert to fraction form
    138,375.77/190,870.77 = 87,299.28/x
  3. Step 3: Cross multiply
    138,375.77x = 190,870.77 × 87,299.28
  4. Step 4: Simplify right side
    138,375.77x = 16,662,880,794.05
  5. Step 5: Solve for x
    x = 16,662,880,794.05/138,375.77
  6. Step 6: Final answer
    x = 120,417.62

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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.