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Finding the Fourth Proportional to 1,025.78, 1,538.67 and 256.28

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Solution

The fourth proportional to 1,025.78, 1,538.67 and 256.28 is: 384.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,025.78 : 1,538.67 = 256.28 : x
  2. Step 2: Convert to fraction form
    1,025.78/1,538.67 = 256.28/x
  3. Step 3: Cross multiply
    1,025.78x = 1,538.67 × 256.28
  4. Step 4: Simplify right side
    1,025.78x = 394,330.35
  5. Step 5: Solve for x
    x = 394,330.35/1,025.78
  6. Step 6: Final answer
    x = 384.42

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1.5x scale

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.