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Finding the Fourth Proportional to 391,903.71, 587,954.36 and 111,420.96

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Solution

The fourth proportional to 391,903.71, 587,954.36 and 111,420.96 is: 167,159.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,903.71 : 587,954.36 = 111,420.96 : x
  2. Step 2: Convert to fraction form
    391,903.71/587,954.36 = 111,420.96/x
  3. Step 3: Cross multiply
    391,903.71x = 587,954.36 × 111,420.96
  4. Step 4: Simplify right side
    391,903.71x = 65,510,439,227.39
  5. Step 5: Solve for x
    x = 65,510,439,227.39/391,903.71
  6. Step 6: Final answer
    x = 167,159.53

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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.