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Finding the Fourth Proportional to 390,221.76, 585,388.44 and 120,372.69

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Solution

The fourth proportional to 390,221.76, 585,388.44 and 120,372.69 is: 180,576.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,221.76 : 585,388.44 = 120,372.69 : x
  2. Step 2: Convert to fraction form
    390,221.76/585,388.44 = 120,372.69/x
  3. Step 3: Cross multiply
    390,221.76x = 585,388.44 × 120,372.69
  4. Step 4: Simplify right side
    390,221.76x = 70,464,781,217.70
  5. Step 5: Solve for x
    x = 70,464,781,217.70/390,221.76
  6. Step 6: Final answer
    x = 180,576.25

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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.