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Finding the Fourth Proportional to 1,361.49, 1,878.93 and 772.08

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Solution

The fourth proportional to 1,361.49, 1,878.93 and 772.08 is: 1,065.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.49 : 1,878.93 = 772.08 : x
  2. Step 2: Convert to fraction form
    1,361.49/1,878.93 = 772.08/x
  3. Step 3: Cross multiply
    1,361.49x = 1,878.93 × 772.08
  4. Step 4: Simplify right side
    1,361.49x = 1,450,684.27
  5. Step 5: Solve for x
    x = 1,450,684.27/1,361.49
  6. Step 6: Final answer
    x = 1,065.51

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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.