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Finding the Fourth Proportional to 1,212.87, 1,818.93 and 627.69

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Solution

The fourth proportional to 1,212.87, 1,818.93 and 627.69 is: 941.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.87 : 1,818.93 = 627.69 : x
  2. Step 2: Convert to fraction form
    1,212.87/1,818.93 = 627.69/x
  3. Step 3: Cross multiply
    1,212.87x = 1,818.93 × 627.69
  4. Step 4: Simplify right side
    1,212.87x = 1,141,724.17
  5. Step 5: Solve for x
    x = 1,141,724.17/1,212.87
  6. Step 6: Final answer
    x = 941.34

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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.