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Finding the Fourth Proportional to 399,410.94, 551,191.48 and 218,128.20

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Solution

The fourth proportional to 399,410.94, 551,191.48 and 218,128.20 is: 301,019.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,410.94 : 551,191.48 = 218,128.20 : x
  2. Step 2: Convert to fraction form
    399,410.94/551,191.48 = 218,128.20/x
  3. Step 3: Cross multiply
    399,410.94x = 551,191.48 × 218,128.20
  4. Step 4: Simplify right side
    399,410.94x = 120,230,405,443.81
  5. Step 5: Solve for x
    x = 120,230,405,443.81/399,410.94
  6. Step 6: Final answer
    x = 301,019.31

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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.