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Finding the Fourth Proportional to 665,657.20, 996,412.20 and 644,921.20

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Solution

The fourth proportional to 665,657.20, 996,412.20 and 644,921.20 is: 965,372.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,657.20 : 996,412.20 = 644,921.20 : x
  2. Step 2: Convert to fraction form
    665,657.20/996,412.20 = 644,921.20/x
  3. Step 3: Cross multiply
    665,657.20x = 996,412.20 × 644,921.20
  4. Step 4: Simplify right side
    665,657.20x = 642,607,351,718.64
  5. Step 5: Solve for x
    x = 642,607,351,718.64/665,657.20
  6. Step 6: Final answer
    x = 965,372.80

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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.