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Finding the Fourth Proportional to 288.65, 396.39 and 247.20

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Solution

The fourth proportional to 288.65, 396.39 and 247.20 is: 339.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.65 : 396.39 = 247.20 : x
  2. Step 2: Convert to fraction form
    288.65/396.39 = 247.20/x
  3. Step 3: Cross multiply
    288.65x = 396.39 × 247.20
  4. Step 4: Simplify right side
    288.65x = 97,987.61
  5. Step 5: Solve for x
    x = 97,987.61/288.65
  6. Step 6: Final answer
    x = 339.47

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.