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Finding the Fourth Proportional to 1,445.50, 2,168.70 and 419.50

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Solution

The fourth proportional to 1,445.50, 2,168.70 and 419.50 is: 629.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,445.50 : 2,168.70 = 419.50 : x
  2. Step 2: Convert to fraction form
    1,445.50/2,168.70 = 419.50/x
  3. Step 3: Cross multiply
    1,445.50x = 2,168.70 × 419.50
  4. Step 4: Simplify right side
    1,445.50x = 909,769.65
  5. Step 5: Solve for x
    x = 909,769.65/1,445.50
  6. Step 6: Final answer
    x = 629.38

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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.