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Finding the Fourth Proportional to 257.48, 355.32 and 139.45

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Solution

The fourth proportional to 257.48, 355.32 and 139.45 is: 192.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.48 : 355.32 = 139.45 : x
  2. Step 2: Convert to fraction form
    257.48/355.32 = 139.45/x
  3. Step 3: Cross multiply
    257.48x = 355.32 × 139.45
  4. Step 4: Simplify right side
    257.48x = 49,550.65
  5. Step 5: Solve for x
    x = 49,550.65/257.48
  6. Step 6: Final answer
    x = 192.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.