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Finding the Fourth Proportional to 100,753.70, 139,043.86 and 55,433.66

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Solution

The fourth proportional to 100,753.70, 139,043.86 and 55,433.66 is: 76,500.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,753.70 : 139,043.86 = 55,433.66 : x
  2. Step 2: Convert to fraction form
    100,753.70/139,043.86 = 55,433.66/x
  3. Step 3: Cross multiply
    100,753.70x = 139,043.86 × 55,433.66
  4. Step 4: Simplify right side
    100,753.70x = 7,707,710,060.33
  5. Step 5: Solve for x
    x = 7,707,710,060.33/100,753.70
  6. Step 6: Final answer
    x = 76,500.52

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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.