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Finding the Fourth Proportional to 1,219.06, 1,682.40 and 777.16

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Solution

The fourth proportional to 1,219.06, 1,682.40 and 777.16 is: 1,072.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.06 : 1,682.40 = 777.16 : x
  2. Step 2: Convert to fraction form
    1,219.06/1,682.40 = 777.16/x
  3. Step 3: Cross multiply
    1,219.06x = 1,682.40 × 777.16
  4. Step 4: Simplify right side
    1,219.06x = 1,307,493.98
  5. Step 5: Solve for x
    x = 1,307,493.98/1,219.06
  6. Step 6: Final answer
    x = 1,072.54

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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.