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Finding the Fourth Proportional to 390.86, 587.21 and 336.18

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Solution

The fourth proportional to 390.86, 587.21 and 336.18 is: 505.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.86 : 587.21 = 336.18 : x
  2. Step 2: Convert to fraction form
    390.86/587.21 = 336.18/x
  3. Step 3: Cross multiply
    390.86x = 587.21 × 336.18
  4. Step 4: Simplify right side
    390.86x = 197,408.78
  5. Step 5: Solve for x
    x = 197,408.78/390.86
  6. Step 6: Final answer
    x = 505.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.