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Finding the Fourth Proportional to 351.70, 528.60 and 291.22

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Solution

The fourth proportional to 351.70, 528.60 and 291.22 is: 437.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.70 : 528.60 = 291.22 : x
  2. Step 2: Convert to fraction form
    351.70/528.60 = 291.22/x
  3. Step 3: Cross multiply
    351.70x = 528.60 × 291.22
  4. Step 4: Simplify right side
    351.70x = 153,938.89
  5. Step 5: Solve for x
    x = 153,938.89/351.70
  6. Step 6: Final answer
    x = 437.70

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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.