Home / 100,168.03-138,325.69-64,420.30

Finding the Fourth Proportional to 100,168.03, 138,325.69 and 64,420.30

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Solution

The fourth proportional to 100,168.03, 138,325.69 and 64,420.30 is: 88,960.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,168.03 : 138,325.69 = 64,420.30 : x
  2. Step 2: Convert to fraction form
    100,168.03/138,325.69 = 64,420.30/x
  3. Step 3: Cross multiply
    100,168.03x = 138,325.69 × 64,420.30
  4. Step 4: Simplify right side
    100,168.03x = 8,910,982,286.46
  5. Step 5: Solve for x
    x = 8,910,982,286.46/100,168.03
  6. Step 6: Final answer
    x = 88,960.34

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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.