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Finding the Fourth Proportional to 100,809.47, 139,115.96 and 55,486.48

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Solution

The fourth proportional to 100,809.47, 139,115.96 and 55,486.48 is: 76,570.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,809.47 : 139,115.96 = 55,486.48 : x
  2. Step 2: Convert to fraction form
    100,809.47/139,115.96 = 55,486.48/x
  3. Step 3: Cross multiply
    100,809.47x = 139,115.96 × 55,486.48
  4. Step 4: Simplify right side
    100,809.47x = 7,719,054,236.64
  5. Step 5: Solve for x
    x = 7,719,054,236.64/100,809.47
  6. Step 6: Final answer
    x = 76,570.73

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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.