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Finding the Fourth Proportional to 771.69, 1,155.72 and 608.88

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Solution

The fourth proportional to 771.69, 1,155.72 and 608.88 is: 911.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.69 : 1,155.72 = 608.88 : x
  2. Step 2: Convert to fraction form
    771.69/1,155.72 = 608.88/x
  3. Step 3: Cross multiply
    771.69x = 1,155.72 × 608.88
  4. Step 4: Simplify right side
    771.69x = 703,694.79
  5. Step 5: Solve for x
    x = 703,694.79/771.69
  6. Step 6: Final answer
    x = 911.89

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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.