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Finding the Fourth Proportional to 399,704.36, 551,593.48 and 218,416.31

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Solution

The fourth proportional to 399,704.36, 551,593.48 and 218,416.31 is: 301,415.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,704.36 : 551,593.48 = 218,416.31 : x
  2. Step 2: Convert to fraction form
    399,704.36/551,593.48 = 218,416.31/x
  3. Step 3: Cross multiply
    399,704.36x = 551,593.48 × 218,416.31
  4. Step 4: Simplify right side
    399,704.36x = 120,477,012,521.66
  5. Step 5: Solve for x
    x = 120,477,012,521.66/399,704.36
  6. Step 6: Final answer
    x = 301,415.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.