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Finding the Fourth Proportional to 398,918.88, 550,509.84 and 217,630.26

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Solution

The fourth proportional to 398,918.88, 550,509.84 and 217,630.26 is: 300,330.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,918.88 : 550,509.84 = 217,630.26 : x
  2. Step 2: Convert to fraction form
    398,918.88/550,509.84 = 217,630.26/x
  3. Step 3: Cross multiply
    398,918.88x = 550,509.84 × 217,630.26
  4. Step 4: Simplify right side
    398,918.88x = 119,807,599,611.76
  5. Step 5: Solve for x
    x = 119,807,599,611.76/398,918.88
  6. Step 6: Final answer
    x = 300,330.73

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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.