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Finding the Fourth Proportional to 351.90, 528.60 and 215.02

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Solution

The fourth proportional to 351.90, 528.60 and 215.02 is: 322.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.90 : 528.60 = 215.02 : x
  2. Step 2: Convert to fraction form
    351.90/528.60 = 215.02/x
  3. Step 3: Cross multiply
    351.90x = 528.60 × 215.02
  4. Step 4: Simplify right side
    351.90x = 113,659.57
  5. Step 5: Solve for x
    x = 113,659.57/351.90
  6. Step 6: Final answer
    x = 322.99

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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.