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Finding the Fourth Proportional to 385.06, 531.28 and 219.22

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Solution

The fourth proportional to 385.06, 531.28 and 219.22 is: 302.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.06 : 531.28 = 219.22 : x
  2. Step 2: Convert to fraction form
    385.06/531.28 = 219.22/x
  3. Step 3: Cross multiply
    385.06x = 531.28 × 219.22
  4. Step 4: Simplify right side
    385.06x = 116,466.11
  5. Step 5: Solve for x
    x = 116,466.11/385.06
  6. Step 6: Final answer
    x = 302.47

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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.