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Finding the Fourth Proportional to 385.40, 531.97 and 228.02

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Solution

The fourth proportional to 385.40, 531.97 and 228.02 is: 314.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.40 : 531.97 = 228.02 : x
  2. Step 2: Convert to fraction form
    385.40/531.97 = 228.02/x
  3. Step 3: Cross multiply
    385.40x = 531.97 × 228.02
  4. Step 4: Simplify right side
    385.40x = 121,299.80
  5. Step 5: Solve for x
    x = 121,299.80/385.40
  6. Step 6: Final answer
    x = 314.74

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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.