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Finding the Fourth Proportional to 399,411.19, 551,191.83 and 218,128.45

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Solution

The fourth proportional to 399,411.19, 551,191.83 and 218,128.45 is: 301,019.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,411.19 : 551,191.83 = 218,128.45 : x
  2. Step 2: Convert to fraction form
    399,411.19/551,191.83 = 218,128.45/x
  3. Step 3: Cross multiply
    399,411.19x = 551,191.83 × 218,128.45
  4. Step 4: Simplify right side
    399,411.19x = 120,230,618,439.92
  5. Step 5: Solve for x
    x = 120,230,618,439.92/399,411.19
  6. Step 6: Final answer
    x = 301,019.66

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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.