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Finding the Fourth Proportional to 399,968, 551,967.36 and 221,131.52

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Solution

The fourth proportional to 399,968, 551,967.36 and 221,131.52 is: 305,167.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,968 : 551,967.36 = 221,131.52 : x
  2. Step 2: Convert to fraction form
    399,968/551,967.36 = 221,131.52/x
  3. Step 3: Cross multiply
    399,968x = 551,967.36 × 221,131.52
  4. Step 4: Simplify right side
    399,968x = 122,057,381,307.19
  5. Step 5: Solve for x
    x = 122,057,381,307.19/399,968
  6. Step 6: Final answer
    x = 305,167.87

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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.