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Finding the Fourth Proportional to 669.77, 1,004.45 and 279.77

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Solution

The fourth proportional to 669.77, 1,004.45 and 279.77 is: 419.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.77 : 1,004.45 = 279.77 : x
  2. Step 2: Convert to fraction form
    669.77/1,004.45 = 279.77/x
  3. Step 3: Cross multiply
    669.77x = 1,004.45 × 279.77
  4. Step 4: Simplify right side
    669.77x = 281,013.58
  5. Step 5: Solve for x
    x = 281,013.58/669.77
  6. Step 6: Final answer
    x = 419.57

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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.