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Finding the Fourth Proportional to 100,990.68, 139,366.35 and 55,050.21

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Solution

The fourth proportional to 100,990.68, 139,366.35 and 55,050.21 is: 75,968.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,990.68 : 139,366.35 = 55,050.21 : x
  2. Step 2: Convert to fraction form
    100,990.68/139,366.35 = 55,050.21/x
  3. Step 3: Cross multiply
    100,990.68x = 139,366.35 × 55,050.21
  4. Step 4: Simplify right side
    100,990.68x = 7,672,146,834.43
  5. Step 5: Solve for x
    x = 7,672,146,834.43/100,990.68
  6. Step 6: Final answer
    x = 75,968.86

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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.