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Finding the Fourth Proportional to 644,615.40, 965,756.70 and 395,005.80

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Solution

The fourth proportional to 644,615.40, 965,756.70 and 395,005.80 is: 591,793.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,615.40 : 965,756.70 = 395,005.80 : x
  2. Step 2: Convert to fraction form
    644,615.40/965,756.70 = 395,005.80/x
  3. Step 3: Cross multiply
    644,615.40x = 965,756.70 × 395,005.80
  4. Step 4: Simplify right side
    644,615.40x = 381,479,497,888.86
  5. Step 5: Solve for x
    x = 381,479,497,888.86/644,615.40
  6. Step 6: Final answer
    x = 591,793.96

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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.