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Finding the Fourth Proportional to 289,921.20, 434,881.80 and 190,129.20

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Solution

The fourth proportional to 289,921.20, 434,881.80 and 190,129.20 is: 285,193.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,921.20 : 434,881.80 = 190,129.20 : x
  2. Step 2: Convert to fraction form
    289,921.20/434,881.80 = 190,129.20/x
  3. Step 3: Cross multiply
    289,921.20x = 434,881.80 × 190,129.20
  4. Step 4: Simplify right side
    289,921.20x = 82,683,728,728.56
  5. Step 5: Solve for x
    x = 82,683,728,728.56/289,921.20
  6. Step 6: Final answer
    x = 285,193.80

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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.