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Finding the Fourth Proportional to 391,021.92, 539,610.32 and 221,252.64

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Solution

The fourth proportional to 391,021.92, 539,610.32 and 221,252.64 is: 305,328.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,021.92 : 539,610.32 = 221,252.64 : x
  2. Step 2: Convert to fraction form
    391,021.92/539,610.32 = 221,252.64/x
  3. Step 3: Cross multiply
    391,021.92x = 539,610.32 × 221,252.64
  4. Step 4: Simplify right side
    391,021.92x = 119,390,207,871.25
  5. Step 5: Solve for x
    x = 119,390,207,871.25/391,021.92
  6. Step 6: Final answer
    x = 305,328.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.