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Finding the Fourth Proportional to 399,636.89, 551,492.48 and 218,344.93

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Solution

The fourth proportional to 399,636.89, 551,492.48 and 218,344.93 is: 301,312.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,636.89 : 551,492.48 = 218,344.93 : x
  2. Step 2: Convert to fraction form
    399,636.89/551,492.48 = 218,344.93/x
  3. Step 3: Cross multiply
    399,636.89x = 551,492.48 × 218,344.93
  4. Step 4: Simplify right side
    399,636.89x = 120,415,584,470.67
  5. Step 5: Solve for x
    x = 120,415,584,470.67/399,636.89
  6. Step 6: Final answer
    x = 301,312.48

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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.