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Finding the Fourth Proportional to 518.86, 715.24 and 408.15

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Solution

The fourth proportional to 518.86, 715.24 and 408.15 is: 562.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.86 : 715.24 = 408.15 : x
  2. Step 2: Convert to fraction form
    518.86/715.24 = 408.15/x
  3. Step 3: Cross multiply
    518.86x = 715.24 × 408.15
  4. Step 4: Simplify right side
    518.86x = 291,925.21
  5. Step 5: Solve for x
    x = 291,925.21/518.86
  6. Step 6: Final answer
    x = 562.63

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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.