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Finding the Fourth Proportional to 100,753.74, 139,034.79 and 55,424.43

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Solution

The fourth proportional to 100,753.74, 139,034.79 and 55,424.43 is: 76,482.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,753.74 : 139,034.79 = 55,424.43 : x
  2. Step 2: Convert to fraction form
    100,753.74/139,034.79 = 55,424.43/x
  3. Step 3: Cross multiply
    100,753.74x = 139,034.79 × 55,424.43
  4. Step 4: Simplify right side
    100,753.74x = 7,705,923,985.92
  5. Step 5: Solve for x
    x = 7,705,923,985.92/100,753.74
  6. Step 6: Final answer
    x = 76,482.76

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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.