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Finding the Fourth Proportional to 100,816.70, 139,126.00 and 55,493.72

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Solution

The fourth proportional to 100,816.70, 139,126.00 and 55,493.72 is: 76,580.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,816.70 : 139,126.00 = 55,493.72 : x
  2. Step 2: Convert to fraction form
    100,816.70/139,126.00 = 55,493.72/x
  3. Step 3: Cross multiply
    100,816.70x = 139,126.00 × 55,493.72
  4. Step 4: Simplify right side
    100,816.70x = 7,720,618,454.36
  5. Step 5: Solve for x
    x = 7,720,618,454.36/100,816.70
  6. Step 6: Final answer
    x = 76,580.75

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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.