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Finding the Fourth Proportional to 100,356.66, 138,493.74 and 55,038.78

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Solution

The fourth proportional to 100,356.66, 138,493.74 and 55,038.78 is: 75,954.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,356.66 : 138,493.74 = 55,038.78 : x
  2. Step 2: Convert to fraction form
    100,356.66/138,493.74 = 55,038.78/x
  3. Step 3: Cross multiply
    100,356.66x = 138,493.74 × 55,038.78
  4. Step 4: Simplify right side
    100,356.66x = 7,622,526,487.24
  5. Step 5: Solve for x
    x = 7,622,526,487.24/100,356.66
  6. Step 6: Final answer
    x = 75,954.37

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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.