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Finding the Fourth Proportional to 139,257.32, 192,121.28 and 78,814.10

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Solution

The fourth proportional to 139,257.32, 192,121.28 and 78,814.10 is: 108,733.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,257.32 : 192,121.28 = 78,814.10 : x
  2. Step 2: Convert to fraction form
    139,257.32/192,121.28 = 78,814.10/x
  3. Step 3: Cross multiply
    139,257.32x = 192,121.28 × 78,814.10
  4. Step 4: Simplify right side
    139,257.32x = 15,141,865,774.05
  5. Step 5: Solve for x
    x = 15,141,865,774.05/139,257.32
  6. Step 6: Final answer
    x = 108,733.00

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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.