Home / 1,419.90-2,130.30-639.81

Finding the Fourth Proportional to 1,419.90, 2,130.30 and 639.81

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Solution

The fourth proportional to 1,419.90, 2,130.30 and 639.81 is: 959.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.90 : 2,130.30 = 639.81 : x
  2. Step 2: Convert to fraction form
    1,419.90/2,130.30 = 639.81/x
  3. Step 3: Cross multiply
    1,419.90x = 2,130.30 × 639.81
  4. Step 4: Simplify right side
    1,419.90x = 1,362,987.24
  5. Step 5: Solve for x
    x = 1,362,987.24/1,419.90
  6. Step 6: Final answer
    x = 959.92

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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.