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Finding the Fourth Proportional to 412.51, 618.69 and 123.88

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Solution

The fourth proportional to 412.51, 618.69 and 123.88 is: 185.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.51 : 618.69 = 123.88 : x
  2. Step 2: Convert to fraction form
    412.51/618.69 = 123.88/x
  3. Step 3: Cross multiply
    412.51x = 618.69 × 123.88
  4. Step 4: Simplify right side
    412.51x = 76,643.32
  5. Step 5: Solve for x
    x = 76,643.32/412.51
  6. Step 6: Final answer
    x = 185.80

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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.