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Finding the Fourth Proportional to 100,672.70, 138,928.58 and 55,355.30

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Solution

The fourth proportional to 100,672.70, 138,928.58 and 55,355.30 is: 76,390.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,672.70 : 138,928.58 = 55,355.30 : x
  2. Step 2: Convert to fraction form
    100,672.70/138,928.58 = 55,355.30/x
  3. Step 3: Cross multiply
    100,672.70x = 138,928.58 × 55,355.30
  4. Step 4: Simplify right side
    100,672.70x = 7,690,432,947.70
  5. Step 5: Solve for x
    x = 7,690,432,947.70/100,672.70
  6. Step 6: Final answer
    x = 76,390.45

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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.