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Finding the Fourth Proportional to 665,756.20, 998,051.10 and 399,233.80

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Solution

The fourth proportional to 665,756.20, 998,051.10 and 399,233.80 is: 598,500.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,756.20 : 998,051.10 = 399,233.80 : x
  2. Step 2: Convert to fraction form
    665,756.20/998,051.10 = 399,233.80/x
  3. Step 3: Cross multiply
    665,756.20x = 998,051.10 × 399,233.80
  4. Step 4: Simplify right side
    665,756.20x = 398,455,733,247.18
  5. Step 5: Solve for x
    x = 398,455,733,247.18/665,756.20
  6. Step 6: Final answer
    x = 598,500.97

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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.