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Finding the Fourth Proportional to 385.13, 531.48 and 219.35

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Solution

The fourth proportional to 385.13, 531.48 and 219.35 is: 302.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.13 : 531.48 = 219.35 : x
  2. Step 2: Convert to fraction form
    385.13/531.48 = 219.35/x
  3. Step 3: Cross multiply
    385.13x = 531.48 × 219.35
  4. Step 4: Simplify right side
    385.13x = 116,577.48
  5. Step 5: Solve for x
    x = 116,577.48/385.13
  6. Step 6: Final answer
    x = 302.70

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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.