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Finding the Fourth Proportional to 210,690.11, 290,719.73 and 120,049.90

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Solution

The fourth proportional to 210,690.11, 290,719.73 and 120,049.90 is: 165,650.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,690.11 : 290,719.73 = 120,049.90 : x
  2. Step 2: Convert to fraction form
    210,690.11/290,719.73 = 120,049.90/x
  3. Step 3: Cross multiply
    210,690.11x = 290,719.73 × 120,049.90
  4. Step 4: Simplify right side
    210,690.11x = 34,900,874,087.85
  5. Step 5: Solve for x
    x = 34,900,874,087.85/210,690.11
  6. Step 6: Final answer
    x = 165,650.27

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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.