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Finding the Fourth Proportional to 254.50, 379.93 and 215.72

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Solution

The fourth proportional to 254.50, 379.93 and 215.72 is: 322.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.50 : 379.93 = 215.72 : x
  2. Step 2: Convert to fraction form
    254.50/379.93 = 215.72/x
  3. Step 3: Cross multiply
    254.50x = 379.93 × 215.72
  4. Step 4: Simplify right side
    254.50x = 81,957.42
  5. Step 5: Solve for x
    x = 81,957.42/254.50
  6. Step 6: Final answer
    x = 322.03

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.