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Finding the Fourth Proportional to 100,736.63, 139,020.17 and 55,418.10

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Solution

The fourth proportional to 100,736.63, 139,020.17 and 55,418.10 is: 76,478.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,736.63 : 139,020.17 = 55,418.10 : x
  2. Step 2: Convert to fraction form
    100,736.63/139,020.17 = 55,418.10/x
  3. Step 3: Cross multiply
    100,736.63x = 139,020.17 × 55,418.10
  4. Step 4: Simplify right side
    100,736.63x = 7,704,233,683.08
  5. Step 5: Solve for x
    x = 7,704,233,683.08/100,736.63
  6. Step 6: Final answer
    x = 76,478.97

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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.