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Finding the Fourth Proportional to 391.63, 540.51 and 236.47

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Solution

The fourth proportional to 391.63, 540.51 and 236.47 is: 326.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.63 : 540.51 = 236.47 : x
  2. Step 2: Convert to fraction form
    391.63/540.51 = 236.47/x
  3. Step 3: Cross multiply
    391.63x = 540.51 × 236.47
  4. Step 4: Simplify right side
    391.63x = 127,810.51
  5. Step 5: Solve for x
    x = 127,810.51/391.63
  6. Step 6: Final answer
    x = 326.36

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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.