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Finding the Fourth Proportional to 518.51, 716.49 and 393.95

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Solution

The fourth proportional to 518.51, 716.49 and 393.95 is: 544.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.51 : 716.49 = 393.95 : x
  2. Step 2: Convert to fraction form
    518.51/716.49 = 393.95/x
  3. Step 3: Cross multiply
    518.51x = 716.49 × 393.95
  4. Step 4: Simplify right side
    518.51x = 282,261.24
  5. Step 5: Solve for x
    x = 282,261.24/518.51
  6. Step 6: Final answer
    x = 544.37

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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.