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Finding the Fourth Proportional to 665,786.40, 998,096.40 and 399,652.80

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Solution

The fourth proportional to 665,786.40, 998,096.40 and 399,652.80 is: 599,129.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,786.40 : 998,096.40 = 399,652.80 : x
  2. Step 2: Convert to fraction form
    665,786.40/998,096.40 = 399,652.80/x
  3. Step 3: Cross multiply
    665,786.40x = 998,096.40 × 399,652.80
  4. Step 4: Simplify right side
    665,786.40x = 398,892,020,929.92
  5. Step 5: Solve for x
    x = 398,892,020,929.92/665,786.40
  6. Step 6: Final answer
    x = 599,129.12

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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.