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Finding the Fourth Proportional to 668.22, 921.06 and 528.06

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Solution

The fourth proportional to 668.22, 921.06 and 528.06 is: 727.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.22 : 921.06 = 528.06 : x
  2. Step 2: Convert to fraction form
    668.22/921.06 = 528.06/x
  3. Step 3: Cross multiply
    668.22x = 921.06 × 528.06
  4. Step 4: Simplify right side
    668.22x = 486,374.94
  5. Step 5: Solve for x
    x = 486,374.94/668.22
  6. Step 6: Final answer
    x = 727.87

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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.