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Finding the Fourth Proportional to 100,453.75, 138,631.21 and 55,131.34

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Solution

The fourth proportional to 100,453.75, 138,631.21 and 55,131.34 is: 76,084.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,453.75 : 138,631.21 = 55,131.34 : x
  2. Step 2: Convert to fraction form
    100,453.75/138,631.21 = 55,131.34/x
  3. Step 3: Cross multiply
    100,453.75x = 138,631.21 × 55,131.34
  4. Step 4: Simplify right side
    100,453.75x = 7,642,924,373.12
  5. Step 5: Solve for x
    x = 7,642,924,373.12/100,453.75
  6. Step 6: Final answer
    x = 76,084.01

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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.