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Finding the Fourth Proportional to 390,339.52, 585,110.22 and 221,503.12

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Solution

The fourth proportional to 390,339.52, 585,110.22 and 221,503.12 is: 332,028.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,339.52 : 585,110.22 = 221,503.12 : x
  2. Step 2: Convert to fraction form
    390,339.52/585,110.22 = 221,503.12/x
  3. Step 3: Cross multiply
    390,339.52x = 585,110.22 × 221,503.12
  4. Step 4: Simplify right side
    390,339.52x = 129,603,739,273.89
  5. Step 5: Solve for x
    x = 129,603,739,273.89/390,339.52
  6. Step 6: Final answer
    x = 332,028.23

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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.