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Finding the Fourth Proportional to 100,745.37, 139,026.68 and 55,420.71

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Solution

The fourth proportional to 100,745.37, 139,026.68 and 55,420.71 is: 76,479.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,745.37 : 139,026.68 = 55,420.71 : x
  2. Step 2: Convert to fraction form
    100,745.37/139,026.68 = 55,420.71/x
  3. Step 3: Cross multiply
    100,745.37x = 139,026.68 × 55,420.71
  4. Step 4: Simplify right side
    100,745.37x = 7,704,956,723.92
  5. Step 5: Solve for x
    x = 7,704,956,723.92/100,745.37
  6. Step 6: Final answer
    x = 76,479.51

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1.5x scale

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.