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Finding the Fourth Proportional to 421,287.21, 581,332.41 and 239,961.15

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Solution

The fourth proportional to 421,287.21, 581,332.41 and 239,961.15 is: 331,121.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,287.21 : 581,332.41 = 239,961.15 : x
  2. Step 2: Convert to fraction form
    421,287.21/581,332.41 = 239,961.15/x
  3. Step 3: Cross multiply
    421,287.21x = 581,332.41 × 239,961.15
  4. Step 4: Simplify right side
    421,287.21x = 139,497,193,635.87
  5. Step 5: Solve for x
    x = 139,497,193,635.87/421,287.21
  6. Step 6: Final answer
    x = 331,121.36

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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.