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Finding the Fourth Proportional to 100,745.91, 139,024.96 and 55,421.01

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Solution

The fourth proportional to 100,745.91, 139,024.96 and 55,421.01 is: 76,478.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,745.91 : 139,024.96 = 55,421.01 : x
  2. Step 2: Convert to fraction form
    100,745.91/139,024.96 = 55,421.01/x
  3. Step 3: Cross multiply
    100,745.91x = 139,024.96 × 55,421.01
  4. Step 4: Simplify right side
    100,745.91x = 7,704,903,698.41
  5. Step 5: Solve for x
    x = 7,704,903,698.41/100,745.91
  6. Step 6: Final answer
    x = 76,478.58

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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.