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Finding the Fourth Proportional to 100,467.78, 138,555.42 and 75,035.76

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Solution

The fourth proportional to 100,467.78, 138,555.42 and 75,035.76 is: 103,482.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,467.78 : 138,555.42 = 75,035.76 : x
  2. Step 2: Convert to fraction form
    100,467.78/138,555.42 = 75,035.76/x
  3. Step 3: Cross multiply
    100,467.78x = 138,555.42 × 75,035.76
  4. Step 4: Simplify right side
    100,467.78x = 10,396,611,241.82
  5. Step 5: Solve for x
    x = 10,396,611,241.82/100,467.78
  6. Step 6: Final answer
    x = 103,482.04

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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.