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Finding the Fourth Proportional to 1,025.12, 1,537.68 and 255.64

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Solution

The fourth proportional to 1,025.12, 1,537.68 and 255.64 is: 383.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,025.12 : 1,537.68 = 255.64 : x
  2. Step 2: Convert to fraction form
    1,025.12/1,537.68 = 255.64/x
  3. Step 3: Cross multiply
    1,025.12x = 1,537.68 × 255.64
  4. Step 4: Simplify right side
    1,025.12x = 393,092.52
  5. Step 5: Solve for x
    x = 393,092.52/1,025.12
  6. Step 6: Final answer
    x = 383.46

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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.