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Finding the Fourth Proportional to 669.64, 1,004.60 and 279.84

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Solution

The fourth proportional to 669.64, 1,004.60 and 279.84 is: 419.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.64 : 1,004.60 = 279.84 : x
  2. Step 2: Convert to fraction form
    669.64/1,004.60 = 279.84/x
  3. Step 3: Cross multiply
    669.64x = 1,004.60 × 279.84
  4. Step 4: Simplify right side
    669.64x = 281,127.26
  5. Step 5: Solve for x
    x = 281,127.26/669.64
  6. Step 6: Final answer
    x = 419.82

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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.