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Finding the Fourth Proportional to 390,091.80, 585,195.87 and 120,197.37

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Solution

The fourth proportional to 390,091.80, 585,195.87 and 120,197.37 is: 180,313.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,091.80 : 585,195.87 = 120,197.37 : x
  2. Step 2: Convert to fraction form
    390,091.80/585,195.87 = 120,197.37/x
  3. Step 3: Cross multiply
    390,091.80x = 585,195.87 × 120,197.37
  4. Step 4: Simplify right side
    390,091.80x = 70,339,004,508.86
  5. Step 5: Solve for x
    x = 70,339,004,508.86/390,091.80
  6. Step 6: Final answer
    x = 180,313.98

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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.