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Finding the Fourth Proportional to 100,622.25, 138,858.98 and 55,910.25

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Solution

The fourth proportional to 100,622.25, 138,858.98 and 55,910.25 is: 77,156.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,622.25 : 138,858.98 = 55,910.25 : x
  2. Step 2: Convert to fraction form
    100,622.25/138,858.98 = 55,910.25/x
  3. Step 3: Cross multiply
    100,622.25x = 138,858.98 × 55,910.25
  4. Step 4: Simplify right side
    100,622.25x = 7,763,640,006.99
  5. Step 5: Solve for x
    x = 7,763,640,006.99/100,622.25
  6. Step 6: Final answer
    x = 77,156.30

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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.