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Finding the Fourth Proportional to 591,218.76, 815,881.86 and 319,286.68

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Solution

The fourth proportional to 591,218.76, 815,881.86 and 319,286.68 is: 440,615.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    591,218.76 : 815,881.86 = 319,286.68 : x
  2. Step 2: Convert to fraction form
    591,218.76/815,881.86 = 319,286.68/x
  3. Step 3: Cross multiply
    591,218.76x = 815,881.86 × 319,286.68
  4. Step 4: Simplify right side
    591,218.76x = 260,500,208,311.92
  5. Step 5: Solve for x
    x = 260,500,208,311.92/591,218.76
  6. Step 6: Final answer
    x = 440,615.60

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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.