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Finding the Fourth Proportional to 399,499.35, 551,308.49 and 218,211.28

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Solution

The fourth proportional to 399,499.35, 551,308.49 and 218,211.28 is: 301,131.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,499.35 : 551,308.49 = 218,211.28 : x
  2. Step 2: Convert to fraction form
    399,499.35/551,308.49 = 218,211.28/x
  3. Step 3: Cross multiply
    399,499.35x = 551,308.49 × 218,211.28
  4. Step 4: Simplify right side
    399,499.35x = 120,301,730,186.71
  5. Step 5: Solve for x
    x = 120,301,730,186.71/399,499.35
  6. Step 6: Final answer
    x = 301,131.23

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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.