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Finding the Fourth Proportional to 351.90, 529.90 and 261.22

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Solution

The fourth proportional to 351.90, 529.90 and 261.22 is: 393.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.90 : 529.90 = 261.22 : x
  2. Step 2: Convert to fraction form
    351.90/529.90 = 261.22/x
  3. Step 3: Cross multiply
    351.90x = 529.90 × 261.22
  4. Step 4: Simplify right side
    351.90x = 138,420.48
  5. Step 5: Solve for x
    x = 138,420.48/351.90
  6. Step 6: Final answer
    x = 393.35

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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.