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Finding the Fourth Proportional to 139,224.80, 208,837.20 and 136,920.80

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Solution

The fourth proportional to 139,224.80, 208,837.20 and 136,920.80 is: 205,381.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,224.80 : 208,837.20 = 136,920.80 : x
  2. Step 2: Convert to fraction form
    139,224.80/208,837.20 = 136,920.80/x
  3. Step 3: Cross multiply
    139,224.80x = 208,837.20 × 136,920.80
  4. Step 4: Simplify right side
    139,224.80x = 28,594,156,493.76
  5. Step 5: Solve for x
    x = 28,594,156,493.76/139,224.80
  6. Step 6: Final answer
    x = 205,381.20

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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.