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Finding the Fourth Proportional to 257.39, 385.99 and 103.36

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Solution

The fourth proportional to 257.39, 385.99 and 103.36 is: 155.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.39 : 385.99 = 103.36 : x
  2. Step 2: Convert to fraction form
    257.39/385.99 = 103.36/x
  3. Step 3: Cross multiply
    257.39x = 385.99 × 103.36
  4. Step 4: Simplify right side
    257.39x = 39,895.93
  5. Step 5: Solve for x
    x = 39,895.93/257.39
  6. Step 6: Final answer
    x = 155.00

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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.