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Finding the Fourth Proportional to 669.44, 921.60 and 551.60

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Solution

The fourth proportional to 669.44, 921.60 and 551.60 is: 759.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.44 : 921.60 = 551.60 : x
  2. Step 2: Convert to fraction form
    669.44/921.60 = 551.60/x
  3. Step 3: Cross multiply
    669.44x = 921.60 × 551.60
  4. Step 4: Simplify right side
    669.44x = 508,354.56
  5. Step 5: Solve for x
    x = 508,354.56/669.44
  6. Step 6: Final answer
    x = 759.37

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1.5x scale

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.