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Finding the Fourth Proportional to 1,028.56, 1,420.06 and 679.72

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Solution

The fourth proportional to 1,028.56, 1,420.06 and 679.72 is: 938.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.56 : 1,420.06 = 679.72 : x
  2. Step 2: Convert to fraction form
    1,028.56/1,420.06 = 679.72/x
  3. Step 3: Cross multiply
    1,028.56x = 1,420.06 × 679.72
  4. Step 4: Simplify right side
    1,028.56x = 965,243.18
  5. Step 5: Solve for x
    x = 965,243.18/1,028.56
  6. Step 6: Final answer
    x = 938.44

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1.5x scale

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.