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Finding the Fourth Proportional to 399,877.79, 551,830.07 and 218,589.80

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Solution

The fourth proportional to 399,877.79, 551,830.07 and 218,589.80 is: 301,653.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,877.79 : 551,830.07 = 218,589.80 : x
  2. Step 2: Convert to fraction form
    399,877.79/551,830.07 = 218,589.80/x
  3. Step 3: Cross multiply
    399,877.79x = 551,830.07 × 218,589.80
  4. Step 4: Simplify right side
    399,877.79x = 120,624,423,542.34
  5. Step 5: Solve for x
    x = 120,624,423,542.34/399,877.79
  6. Step 6: Final answer
    x = 301,653.22

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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.