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Finding the Fourth Proportional to 852.18, 1,278.66 and 419.28

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Solution

The fourth proportional to 852.18, 1,278.66 and 419.28 is: 629.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.18 : 1,278.66 = 419.28 : x
  2. Step 2: Convert to fraction form
    852.18/1,278.66 = 419.28/x
  3. Step 3: Cross multiply
    852.18x = 1,278.66 × 419.28
  4. Step 4: Simplify right side
    852.18x = 536,116.56
  5. Step 5: Solve for x
    x = 536,116.56/852.18
  6. Step 6: Final answer
    x = 629.11

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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.