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Finding the Fourth Proportional to 291.68, 438.24 and 255.68

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Solution

The fourth proportional to 291.68, 438.24 and 255.68 is: 384.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.68 : 438.24 = 255.68 : x
  2. Step 2: Convert to fraction form
    291.68/438.24 = 255.68/x
  3. Step 3: Cross multiply
    291.68x = 438.24 × 255.68
  4. Step 4: Simplify right side
    291.68x = 112,049.20
  5. Step 5: Solve for x
    x = 112,049.20/291.68
  6. Step 6: Final answer
    x = 384.15

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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.