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Finding the Fourth Proportional to 100,651.10, 138,883.30 and 55,331

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Solution

The fourth proportional to 100,651.10, 138,883.30 and 55,331 is: 76,348.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,651.10 : 138,883.30 = 55,331 : x
  2. Step 2: Convert to fraction form
    100,651.10/138,883.30 = 55,331/x
  3. Step 3: Cross multiply
    100,651.10x = 138,883.30 × 55,331
  4. Step 4: Simplify right side
    100,651.10x = 7,684,551,872.30
  5. Step 5: Solve for x
    x = 7,684,551,872.30/100,651.10
  6. Step 6: Final answer
    x = 76,348.41

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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.