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Finding the Fourth Proportional to 399,286.66, 551,012.74 and 217,998.58

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Solution

The fourth proportional to 399,286.66, 551,012.74 and 217,998.58 is: 300,836.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,286.66 : 551,012.74 = 217,998.58 : x
  2. Step 2: Convert to fraction form
    399,286.66/551,012.74 = 217,998.58/x
  3. Step 3: Cross multiply
    399,286.66x = 551,012.74 × 217,998.58
  4. Step 4: Simplify right side
    399,286.66x = 120,119,994,881.91
  5. Step 5: Solve for x
    x = 120,119,994,881.91/399,286.66
  6. Step 6: Final answer
    x = 300,836.48

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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.