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Finding the Fourth Proportional to 399,639.96, 551,496.66 and 218,347.98

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Solution

The fourth proportional to 399,639.96, 551,496.66 and 218,347.98 is: 301,316.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,639.96 : 551,496.66 = 218,347.98 : x
  2. Step 2: Convert to fraction form
    399,639.96/551,496.66 = 218,347.98/x
  3. Step 3: Cross multiply
    399,639.96x = 551,496.66 × 218,347.98
  4. Step 4: Simplify right side
    399,639.96x = 120,418,181,687.75
  5. Step 5: Solve for x
    x = 120,418,181,687.75/399,639.96
  6. Step 6: Final answer
    x = 301,316.67

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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.