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Finding the Fourth Proportional to 100,838.56, 139,156.09 and 55,515.60

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Solution

The fourth proportional to 100,838.56, 139,156.09 and 55,515.60 is: 76,610.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,838.56 : 139,156.09 = 55,515.60 : x
  2. Step 2: Convert to fraction form
    100,838.56/139,156.09 = 55,515.60/x
  3. Step 3: Cross multiply
    100,838.56x = 139,156.09 × 55,515.60
  4. Step 4: Simplify right side
    100,838.56x = 7,725,333,830.00
  5. Step 5: Solve for x
    x = 7,725,333,830.00/100,838.56
  6. Step 6: Final answer
    x = 76,610.91

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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.