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Finding the Fourth Proportional to 405,247.39, 559,243.15 and 221,489.68

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Solution

The fourth proportional to 405,247.39, 559,243.15 and 221,489.68 is: 305,656.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,247.39 : 559,243.15 = 221,489.68 : x
  2. Step 2: Convert to fraction form
    405,247.39/559,243.15 = 221,489.68/x
  3. Step 3: Cross multiply
    405,247.39x = 559,243.15 × 221,489.68
  4. Step 4: Simplify right side
    405,247.39x = 123,866,586,335.69
  5. Step 5: Solve for x
    x = 123,866,586,335.69/405,247.39
  6. Step 6: Final answer
    x = 305,656.72

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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.