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Finding the Fourth Proportional to 1,351.36, 2,026.78 and 620.76

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Solution

The fourth proportional to 1,351.36, 2,026.78 and 620.76 is: 931.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,351.36 : 2,026.78 = 620.76 : x
  2. Step 2: Convert to fraction form
    1,351.36/2,026.78 = 620.76/x
  3. Step 3: Cross multiply
    1,351.36x = 2,026.78 × 620.76
  4. Step 4: Simplify right side
    1,351.36x = 1,258,143.95
  5. Step 5: Solve for x
    x = 1,258,143.95/1,351.36
  6. Step 6: Final answer
    x = 931.02

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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.