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Finding the Fourth Proportional to 321.65, 482.38 and 139.00

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Solution

The fourth proportional to 321.65, 482.38 and 139.00 is: 208.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.65 : 482.38 = 139.00 : x
  2. Step 2: Convert to fraction form
    321.65/482.38 = 139.00/x
  3. Step 3: Cross multiply
    321.65x = 482.38 × 139.00
  4. Step 4: Simplify right side
    321.65x = 67,049.27
  5. Step 5: Solve for x
    x = 67,049.27/321.65
  6. Step 6: Final answer
    x = 208.45

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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.