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Finding the Fourth Proportional to 669.60, 982.80 and 669.60

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Solution

The fourth proportional to 669.60, 982.80 and 669.60 is: 982.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.60 : 982.80 = 669.60 : x
  2. Step 2: Convert to fraction form
    669.60/982.80 = 669.60/x
  3. Step 3: Cross multiply
    669.60x = 982.80 × 669.60
  4. Step 4: Simplify right side
    669.60x = 658,082.88
  5. Step 5: Solve for x
    x = 658,082.88/669.60
  6. Step 6: Final answer
    x = 982.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.