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Finding the Fourth Proportional to 518.60, 715.56 and 394.40

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Solution

The fourth proportional to 518.60, 715.56 and 394.40 is: 544.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.60 : 715.56 = 394.40 : x
  2. Step 2: Convert to fraction form
    518.60/715.56 = 394.40/x
  3. Step 3: Cross multiply
    518.60x = 715.56 × 394.40
  4. Step 4: Simplify right side
    518.60x = 282,216.86
  5. Step 5: Solve for x
    x = 282,216.86/518.60
  6. Step 6: Final answer
    x = 544.19

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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.