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Finding the Fourth Proportional to 3,078.50, 4,617.75 and 770

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Solution

The fourth proportional to 3,078.50, 4,617.75 and 770 is: 1,155

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,078.50 : 4,617.75 = 770 : x
  2. Step 2: Convert to fraction form
    3,078.50/4,617.75 = 770/x
  3. Step 3: Cross multiply
    3,078.50x = 4,617.75 × 770
  4. Step 4: Simplify right side
    3,078.50x = 3,555,667.50
  5. Step 5: Solve for x
    x = 3,555,667.50/3,078.50
  6. Step 6: Final answer
    x = 1,155

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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.