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Finding the Fourth Proportional to 412, 618 and 123.43

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Solution

The fourth proportional to 412, 618 and 123.43 is: 185.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    412 : 618 = 123.43 : x
  2. Step 2: Convert to fraction form
    412/618 = 123.43/x
  3. Step 3: Cross multiply
    412x = 618 × 123.43
  4. Step 4: Simplify right side
    412x = 76,279.74
  5. Step 5: Solve for x
    x = 76,279.74/412
  6. Step 6: Final answer
    x = 185.15

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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.