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Finding the Fourth Proportional to 738,912.75, 1,019,700.81 and 399,381

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Solution

The fourth proportional to 738,912.75, 1,019,700.81 and 399,381 is: 551,146.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    738,912.75 : 1,019,700.81 = 399,381 : x
  2. Step 2: Convert to fraction form
    738,912.75/1,019,700.81 = 399,381/x
  3. Step 3: Cross multiply
    738,912.75x = 1,019,700.81 × 399,381
  4. Step 4: Simplify right side
    738,912.75x = 407,249,129,198.61
  5. Step 5: Solve for x
    x = 407,249,129,198.61/738,912.75
  6. Step 6: Final answer
    x = 551,146.44

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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.