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Finding the Fourth Proportional to 665,123.20, 995,611.20 and 644,387.20

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Solution

The fourth proportional to 665,123.20, 995,611.20 and 644,387.20 is: 964,571.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,123.20 : 995,611.20 = 644,387.20 : x
  2. Step 2: Convert to fraction form
    665,123.20/995,611.20 = 644,387.20/x
  3. Step 3: Cross multiply
    665,123.20x = 995,611.20 × 644,387.20
  4. Step 4: Simplify right side
    665,123.20x = 641,559,113,456.64
  5. Step 5: Solve for x
    x = 641,559,113,456.64/665,123.20
  6. Step 6: Final answer
    x = 964,571.85

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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.