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Finding the Fourth Proportional to 385.51, 531.99 and 228.12

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Solution

The fourth proportional to 385.51, 531.99 and 228.12 is: 314.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.51 : 531.99 = 228.12 : x
  2. Step 2: Convert to fraction form
    385.51/531.99 = 228.12/x
  3. Step 3: Cross multiply
    385.51x = 531.99 × 228.12
  4. Step 4: Simplify right side
    385.51x = 121,357.56
  5. Step 5: Solve for x
    x = 121,357.56/385.51
  6. Step 6: Final answer
    x = 314.80

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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.