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Finding the Fourth Proportional to 872.55, 1,308.86 and 256.24

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Solution

The fourth proportional to 872.55, 1,308.86 and 256.24 is: 384.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.55 : 1,308.86 = 256.24 : x
  2. Step 2: Convert to fraction form
    872.55/1,308.86 = 256.24/x
  3. Step 3: Cross multiply
    872.55x = 1,308.86 × 256.24
  4. Step 4: Simplify right side
    872.55x = 335,379.92
  5. Step 5: Solve for x
    x = 335,379.92/872.55
  6. Step 6: Final answer
    x = 384.37

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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.