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Finding the Fourth Proportional to 1,361.09, 1,878.40 and 763.60

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Solution

The fourth proportional to 1,361.09, 1,878.40 and 763.60 is: 1,053.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.09 : 1,878.40 = 763.60 : x
  2. Step 2: Convert to fraction form
    1,361.09/1,878.40 = 763.60/x
  3. Step 3: Cross multiply
    1,361.09x = 1,878.40 × 763.60
  4. Step 4: Simplify right side
    1,361.09x = 1,434,346.24
  5. Step 5: Solve for x
    x = 1,434,346.24/1,361.09
  6. Step 6: Final answer
    x = 1,053.82

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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.