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Finding the Fourth Proportional to 668.31, 920.36 and 654

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Solution

The fourth proportional to 668.31, 920.36 and 654 is: 900.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.31 : 920.36 = 654 : x
  2. Step 2: Convert to fraction form
    668.31/920.36 = 654/x
  3. Step 3: Cross multiply
    668.31x = 920.36 × 654
  4. Step 4: Simplify right side
    668.31x = 601,915.44
  5. Step 5: Solve for x
    x = 601,915.44/668.31
  6. Step 6: Final answer
    x = 900.65

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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.