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Finding the Fourth Proportional to 385.40, 531.60 and 230

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Solution

The fourth proportional to 385.40, 531.60 and 230 is: 317.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.40 : 531.60 = 230 : x
  2. Step 2: Convert to fraction form
    385.40/531.60 = 230/x
  3. Step 3: Cross multiply
    385.40x = 531.60 × 230
  4. Step 4: Simplify right side
    385.40x = 122,268
  5. Step 5: Solve for x
    x = 122,268/385.40
  6. Step 6: Final answer
    x = 317.25

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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.