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Finding the Fourth Proportional to 738,911.75, 1,019,699.43 and 399,380

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Solution

The fourth proportional to 738,911.75, 1,019,699.43 and 399,380 is: 551,145.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    738,911.75 : 1,019,699.43 = 399,380 : x
  2. Step 2: Convert to fraction form
    738,911.75/1,019,699.43 = 399,380/x
  3. Step 3: Cross multiply
    738,911.75x = 1,019,699.43 × 399,380
  4. Step 4: Simplify right side
    738,911.75x = 407,247,558,353.40
  5. Step 5: Solve for x
    x = 407,247,558,353.40/738,911.75
  6. Step 6: Final answer
    x = 551,145.06

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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.