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Finding the Fourth Proportional to 771.44, 1,154.40 and 669.92

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Solution

The fourth proportional to 771.44, 1,154.40 and 669.92 is: 1,002.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.44 : 1,154.40 = 669.92 : x
  2. Step 2: Convert to fraction form
    771.44/1,154.40 = 669.92/x
  3. Step 3: Cross multiply
    771.44x = 1,154.40 × 669.92
  4. Step 4: Simplify right side
    771.44x = 773,355.65
  5. Step 5: Solve for x
    x = 773,355.65/771.44
  6. Step 6: Final answer
    x = 1,002.48

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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.