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Finding the Fourth Proportional to 139,121.88, 208,713.06 and 45,624.12

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Solution

The fourth proportional to 139,121.88, 208,713.06 and 45,624.12 is: 68,446.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,121.88 : 208,713.06 = 45,624.12 : x
  2. Step 2: Convert to fraction form
    139,121.88/208,713.06 = 45,624.12/x
  3. Step 3: Cross multiply
    139,121.88x = 208,713.06 × 45,624.12
  4. Step 4: Simplify right side
    139,121.88x = 9,522,349,695.01
  5. Step 5: Solve for x
    x = 9,522,349,695.01/139,121.88
  6. Step 6: Final answer
    x = 68,446.10

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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.