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Finding the Fourth Proportional to 399,299.40, 551,035.08 and 218,015.04

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Solution

The fourth proportional to 399,299.40, 551,035.08 and 218,015.04 is: 300,861.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,299.40 : 551,035.08 = 218,015.04 : x
  2. Step 2: Convert to fraction form
    399,299.40/551,035.08 = 218,015.04/x
  3. Step 3: Cross multiply
    399,299.40x = 551,035.08 × 218,015.04
  4. Step 4: Simplify right side
    399,299.40x = 120,133,935,007.60
  5. Step 5: Solve for x
    x = 120,133,935,007.60/399,299.40
  6. Step 6: Final answer
    x = 300,861.80

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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.