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Finding the Fourth Proportional to 3,078.69, 4,618 and 770.19

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Solution

The fourth proportional to 3,078.69, 4,618 and 770.19 is: 1,155.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,078.69 : 4,618 = 770.19 : x
  2. Step 2: Convert to fraction form
    3,078.69/4,618 = 770.19/x
  3. Step 3: Cross multiply
    3,078.69x = 4,618 × 770.19
  4. Step 4: Simplify right side
    3,078.69x = 3,556,737.42
  5. Step 5: Solve for x
    x = 3,556,737.42/3,078.69
  6. Step 6: Final answer
    x = 1,155.28

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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.