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Finding the Fourth Proportional to 399,490.53, 551,293.64 and 218,202.58

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Solution

The fourth proportional to 399,490.53, 551,293.64 and 218,202.58 is: 301,117.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,490.53 : 551,293.64 = 218,202.58 : x
  2. Step 2: Convert to fraction form
    399,490.53/551,293.64 = 218,202.58/x
  3. Step 3: Cross multiply
    399,490.53x = 551,293.64 × 218,202.58
  4. Step 4: Simplify right side
    399,490.53x = 120,293,694,585.59
  5. Step 5: Solve for x
    x = 120,293,694,585.59/399,490.53
  6. Step 6: Final answer
    x = 301,117.76

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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.