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Finding the Fourth Proportional to 387,817.37, 581,709.14 and 121,571.81

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Solution

The fourth proportional to 387,817.37, 581,709.14 and 121,571.81 is: 182,352.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,817.37 : 581,709.14 = 121,571.81 : x
  2. Step 2: Convert to fraction form
    387,817.37/581,709.14 = 121,571.81/x
  3. Step 3: Cross multiply
    387,817.37x = 581,709.14 × 121,571.81
  4. Step 4: Simplify right side
    387,817.37x = 70,719,432,435.48
  5. Step 5: Solve for x
    x = 70,719,432,435.48/387,817.37
  6. Step 6: Final answer
    x = 182,352.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.