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Finding the Fourth Proportional to 669.60, 1,006.56 and 654.48

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Solution

The fourth proportional to 669.60, 1,006.56 and 654.48 is: 983.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.60 : 1,006.56 = 654.48 : x
  2. Step 2: Convert to fraction form
    669.60/1,006.56 = 654.48/x
  3. Step 3: Cross multiply
    669.60x = 1,006.56 × 654.48
  4. Step 4: Simplify right side
    669.60x = 658,773.39
  5. Step 5: Solve for x
    x = 658,773.39/669.60
  6. Step 6: Final answer
    x = 983.83

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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.