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Finding the Fourth Proportional to 100,401.12, 138,552.84 and 55,077.84

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Solution

The fourth proportional to 100,401.12, 138,552.84 and 55,077.84 is: 76,007.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,401.12 : 138,552.84 = 55,077.84 : x
  2. Step 2: Convert to fraction form
    100,401.12/138,552.84 = 55,077.84/x
  3. Step 3: Cross multiply
    100,401.12x = 138,552.84 × 55,077.84
  4. Step 4: Simplify right side
    100,401.12x = 7,631,191,153.07
  5. Step 5: Solve for x
    x = 7,631,191,153.07/100,401.12
  6. Step 6: Final answer
    x = 76,007.03

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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.