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Finding the Fourth Proportional to 100,745.52, 139,031.30 and 55,424.72

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Solution

The fourth proportional to 100,745.52, 139,031.30 and 55,424.72 is: 76,487.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,745.52 : 139,031.30 = 55,424.72 : x
  2. Step 2: Convert to fraction form
    100,745.52/139,031.30 = 55,424.72/x
  3. Step 3: Cross multiply
    100,745.52x = 139,031.30 × 55,424.72
  4. Step 4: Simplify right side
    100,745.52x = 7,705,770,873.74
  5. Step 5: Solve for x
    x = 7,705,770,873.74/100,745.52
  6. Step 6: Final answer
    x = 76,487.48

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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.