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Finding the Fourth Proportional to 385.51, 531.91 and 238.15

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Solution

The fourth proportional to 385.51, 531.91 and 238.15 is: 328.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.51 : 531.91 = 238.15 : x
  2. Step 2: Convert to fraction form
    385.51/531.91 = 238.15/x
  3. Step 3: Cross multiply
    385.51x = 531.91 × 238.15
  4. Step 4: Simplify right side
    385.51x = 126,674.37
  5. Step 5: Solve for x
    x = 126,674.37/385.51
  6. Step 6: Final answer
    x = 328.59

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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.