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Finding the Fourth Proportional to 391,438.48, 540,197.82 and 221,668.96

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Solution

The fourth proportional to 391,438.48, 540,197.82 and 221,668.96 is: 305,910.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,438.48 : 540,197.82 = 221,668.96 : x
  2. Step 2: Convert to fraction form
    391,438.48/540,197.82 = 221,668.96/x
  3. Step 3: Cross multiply
    391,438.48x = 540,197.82 × 221,668.96
  4. Step 4: Simplify right side
    391,438.48x = 119,745,088,953.67
  5. Step 5: Solve for x
    x = 119,745,088,953.67/391,438.48
  6. Step 6: Final answer
    x = 305,910.37

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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.