Home / 1,419.80-2,130.21-639.72

Finding the Fourth Proportional to 1,419.80, 2,130.21 and 639.72

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Solution

The fourth proportional to 1,419.80, 2,130.21 and 639.72 is: 959.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.80 : 2,130.21 = 639.72 : x
  2. Step 2: Convert to fraction form
    1,419.80/2,130.21 = 639.72/x
  3. Step 3: Cross multiply
    1,419.80x = 2,130.21 × 639.72
  4. Step 4: Simplify right side
    1,419.80x = 1,362,737.94
  5. Step 5: Solve for x
    x = 1,362,737.94/1,419.80
  6. Step 6: Final answer
    x = 959.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.