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Finding the Fourth Proportional to 399,715.76, 551,614.97 and 218,435.33

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Solution

The fourth proportional to 399,715.76, 551,614.97 and 218,435.33 is: 301,444.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,715.76 : 551,614.97 = 218,435.33 : x
  2. Step 2: Convert to fraction form
    399,715.76/551,614.97 = 218,435.33/x
  3. Step 3: Cross multiply
    399,715.76x = 551,614.97 × 218,435.33
  4. Step 4: Simplify right side
    399,715.76x = 120,492,199,930.02
  5. Step 5: Solve for x
    x = 120,492,199,930.02/399,715.76
  6. Step 6: Final answer
    x = 301,444.70

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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.