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Finding the Fourth Proportional to 1,025.75, 1,538.61 and 256.25

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Solution

The fourth proportional to 1,025.75, 1,538.61 and 256.25 is: 384.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,025.75 : 1,538.61 = 256.25 : x
  2. Step 2: Convert to fraction form
    1,025.75/1,538.61 = 256.25/x
  3. Step 3: Cross multiply
    1,025.75x = 1,538.61 × 256.25
  4. Step 4: Simplify right side
    1,025.75x = 394,261.12
  5. Step 5: Solve for x
    x = 394,261.12/1,025.75
  6. Step 6: Final answer
    x = 384.37

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Double scale
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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.