Home / 1,428.21-1,973.12-1,220.54

Finding the Fourth Proportional to 1,428.21, 1,973.12 and 1,220.54

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Solution

The fourth proportional to 1,428.21, 1,973.12 and 1,220.54 is: 1,686.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.21 : 1,973.12 = 1,220.54 : x
  2. Step 2: Convert to fraction form
    1,428.21/1,973.12 = 1,220.54/x
  3. Step 3: Cross multiply
    1,428.21x = 1,973.12 × 1,220.54
  4. Step 4: Simplify right side
    1,428.21x = 2,408,255.92
  5. Step 5: Solve for x
    x = 2,408,255.92/1,428.21
  6. Step 6: Final answer
    x = 1,686.21

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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.