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Finding the Fourth Proportional to 665,655.20, 996,409.20 and 644,919.20

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Solution

The fourth proportional to 665,655.20, 996,409.20 and 644,919.20 is: 965,369.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,655.20 : 996,409.20 = 644,919.20 : x
  2. Step 2: Convert to fraction form
    665,655.20/996,409.20 = 644,919.20/x
  3. Step 3: Cross multiply
    665,655.20x = 996,409.20 × 644,919.20
  4. Step 4: Simplify right side
    665,655.20x = 642,603,424,136.64
  5. Step 5: Solve for x
    x = 642,603,424,136.64/665,655.20
  6. Step 6: Final answer
    x = 965,369.80

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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.