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Finding the Fourth Proportional to 399,636.79, 551,492.28 and 218,344.82

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Solution

The fourth proportional to 399,636.79, 551,492.28 and 218,344.82 is: 301,312.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,636.79 : 551,492.28 = 218,344.82 : x
  2. Step 2: Convert to fraction form
    399,636.79/551,492.28 = 218,344.82/x
  3. Step 3: Cross multiply
    399,636.79x = 551,492.28 × 218,344.82
  4. Step 4: Simplify right side
    399,636.79x = 120,415,479,850.53
  5. Step 5: Solve for x
    x = 120,415,479,850.53/399,636.79
  6. Step 6: Final answer
    x = 301,312.30

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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.