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Finding the Fourth Proportional to 390,105.72, 585,240.39 and 221,704.02

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Solution

The fourth proportional to 390,105.72, 585,240.39 and 221,704.02 is: 332,602.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,105.72 : 585,240.39 = 221,704.02 : x
  2. Step 2: Convert to fraction form
    390,105.72/585,240.39 = 221,704.02/x
  3. Step 3: Cross multiply
    390,105.72x = 585,240.39 × 221,704.02
  4. Step 4: Simplify right side
    390,105.72x = 129,750,147,129.37
  5. Step 5: Solve for x
    x = 129,750,147,129.37/390,105.72
  6. Step 6: Final answer
    x = 332,602.52

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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.