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Finding the Fourth Proportional to 351.05, 528.40 and 298.20

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Solution

The fourth proportional to 351.05, 528.40 and 298.20 is: 448.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.05 : 528.40 = 298.20 : x
  2. Step 2: Convert to fraction form
    351.05/528.40 = 298.20/x
  3. Step 3: Cross multiply
    351.05x = 528.40 × 298.20
  4. Step 4: Simplify right side
    351.05x = 157,566.24
  5. Step 5: Solve for x
    x = 157,566.24/351.05
  6. Step 6: Final answer
    x = 448.85

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.