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Finding the Fourth Proportional to 411.52, 618 and 219.52

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Solution

The fourth proportional to 411.52, 618 and 219.52 is: 329.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.52 : 618 = 219.52 : x
  2. Step 2: Convert to fraction form
    411.52/618 = 219.52/x
  3. Step 3: Cross multiply
    411.52x = 618 × 219.52
  4. Step 4: Simplify right side
    411.52x = 135,663.36
  5. Step 5: Solve for x
    x = 135,663.36/411.52
  6. Step 6: Final answer
    x = 329.66

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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.