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Finding the Fourth Proportional to 388,293.81, 536,010.78 and 261,043.21

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Solution

The fourth proportional to 388,293.81, 536,010.78 and 261,043.21 is: 360,350.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,293.81 : 536,010.78 = 261,043.21 : x
  2. Step 2: Convert to fraction form
    388,293.81/536,010.78 = 261,043.21/x
  3. Step 3: Cross multiply
    388,293.81x = 536,010.78 × 261,043.21
  4. Step 4: Simplify right side
    388,293.81x = 139,921,974,605.80
  5. Step 5: Solve for x
    x = 139,921,974,605.80/388,293.81
  6. Step 6: Final answer
    x = 360,350.78

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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.