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Finding the Fourth Proportional to 255.65, 383.38 and 140.18

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Solution

The fourth proportional to 255.65, 383.38 and 140.18 is: 210.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.65 : 383.38 = 140.18 : x
  2. Step 2: Convert to fraction form
    255.65/383.38 = 140.18/x
  3. Step 3: Cross multiply
    255.65x = 383.38 × 140.18
  4. Step 4: Simplify right side
    255.65x = 53,739.94
  5. Step 5: Solve for x
    x = 53,739.94/255.65
  6. Step 6: Final answer
    x = 210.21

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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.