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Finding the Fourth Proportional to 255.90, 383.40 and 210.18

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Solution

The fourth proportional to 255.90, 383.40 and 210.18 is: 314.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.90 : 383.40 = 210.18 : x
  2. Step 2: Convert to fraction form
    255.90/383.40 = 210.18/x
  3. Step 3: Cross multiply
    255.90x = 383.40 × 210.18
  4. Step 4: Simplify right side
    255.90x = 80,583.01
  5. Step 5: Solve for x
    x = 80,583.01/255.90
  6. Step 6: Final answer
    x = 314.90

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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.