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Finding the Fourth Proportional to 1,313.21, 1,978.83 and 1,087.19

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Solution

The fourth proportional to 1,313.21, 1,978.83 and 1,087.19 is: 1,638.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.21 : 1,978.83 = 1,087.19 : x
  2. Step 2: Convert to fraction form
    1,313.21/1,978.83 = 1,087.19/x
  3. Step 3: Cross multiply
    1,313.21x = 1,978.83 × 1,087.19
  4. Step 4: Simplify right side
    1,313.21x = 2,151,361.71
  5. Step 5: Solve for x
    x = 2,151,361.71/1,313.21
  6. Step 6: Final answer
    x = 1,638.24

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.