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Finding the Fourth Proportional to 100,381.56, 150,621.48 and 70,988.28

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Solution

The fourth proportional to 100,381.56, 150,621.48 and 70,988.28 is: 106,517.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,381.56 : 150,621.48 = 70,988.28 : x
  2. Step 2: Convert to fraction form
    100,381.56/150,621.48 = 70,988.28/x
  3. Step 3: Cross multiply
    100,381.56x = 150,621.48 × 70,988.28
  4. Step 4: Simplify right side
    100,381.56x = 10,692,359,796.25
  5. Step 5: Solve for x
    x = 10,692,359,796.25/100,381.56
  6. Step 6: Final answer
    x = 106,517.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.