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Finding the Fourth Proportional to 254.55, 383.57 and 209.90

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Solution

The fourth proportional to 254.55, 383.57 and 209.90 is: 316.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.55 : 383.57 = 209.90 : x
  2. Step 2: Convert to fraction form
    254.55/383.57 = 209.90/x
  3. Step 3: Cross multiply
    254.55x = 383.57 × 209.90
  4. Step 4: Simplify right side
    254.55x = 80,510.29
  5. Step 5: Solve for x
    x = 80,510.29/254.55
  6. Step 6: Final answer
    x = 316.28

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.