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Finding the Fourth Proportional to 391,421.73, 540,161.94 and 221,688.66

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Solution

The fourth proportional to 391,421.73, 540,161.94 and 221,688.66 is: 305,930.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,421.73 : 540,161.94 = 221,688.66 : x
  2. Step 2: Convert to fraction form
    391,421.73/540,161.94 = 221,688.66/x
  3. Step 3: Cross multiply
    391,421.73x = 540,161.94 × 221,688.66
  4. Step 4: Simplify right side
    391,421.73x = 119,747,776,661.60
  5. Step 5: Solve for x
    x = 119,747,776,661.60/391,421.73
  6. Step 6: Final answer
    x = 305,930.32

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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.