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Finding the Fourth Proportional to 390,057.40, 585,086.10 and 221,512.60

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Solution

The fourth proportional to 390,057.40, 585,086.10 and 221,512.60 is: 332,268.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,057.40 : 585,086.10 = 221,512.60 : x
  2. Step 2: Convert to fraction form
    390,057.40/585,086.10 = 221,512.60/x
  3. Step 3: Cross multiply
    390,057.40x = 585,086.10 × 221,512.60
  4. Step 4: Simplify right side
    390,057.40x = 129,603,943,234.86
  5. Step 5: Solve for x
    x = 129,603,943,234.86/390,057.40
  6. Step 6: Final answer
    x = 332,268.90

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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.