Home / 1,370.22-2,055.12-639.73

Finding the Fourth Proportional to 1,370.22, 2,055.12 and 639.73

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Solution

The fourth proportional to 1,370.22, 2,055.12 and 639.73 is: 959.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,370.22 : 2,055.12 = 639.73 : x
  2. Step 2: Convert to fraction form
    1,370.22/2,055.12 = 639.73/x
  3. Step 3: Cross multiply
    1,370.22x = 2,055.12 × 639.73
  4. Step 4: Simplify right side
    1,370.22x = 1,314,721.92
  5. Step 5: Solve for x
    x = 1,314,721.92/1,370.22
  6. Step 6: Final answer
    x = 959.50

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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.