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Finding the Fourth Proportional to 399,328.92, 551,069.69 and 218,040.30

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Solution

The fourth proportional to 399,328.92, 551,069.69 and 218,040.30 is: 300,893.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,328.92 : 551,069.69 = 218,040.30 : x
  2. Step 2: Convert to fraction form
    399,328.92/551,069.69 = 218,040.30/x
  3. Step 3: Cross multiply
    399,328.92x = 551,069.69 × 218,040.30
  4. Step 4: Simplify right side
    399,328.92x = 120,155,399,438.31
  5. Step 5: Solve for x
    x = 120,155,399,438.31/399,328.92
  6. Step 6: Final answer
    x = 300,893.31

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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.