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Finding the Fourth Proportional to 321.45, 482.18 and 123.72

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Solution

The fourth proportional to 321.45, 482.18 and 123.72 is: 185.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.45 : 482.18 = 123.72 : x
  2. Step 2: Convert to fraction form
    321.45/482.18 = 123.72/x
  3. Step 3: Cross multiply
    321.45x = 482.18 × 123.72
  4. Step 4: Simplify right side
    321.45x = 59,655.31
  5. Step 5: Solve for x
    x = 59,655.31/321.45
  6. Step 6: Final answer
    x = 185.58

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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.