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Finding the Fourth Proportional to 421.98, 582.91 and 317.86

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Solution

The fourth proportional to 421.98, 582.91 and 317.86 is: 439.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.98 : 582.91 = 317.86 : x
  2. Step 2: Convert to fraction form
    421.98/582.91 = 317.86/x
  3. Step 3: Cross multiply
    421.98x = 582.91 × 317.86
  4. Step 4: Simplify right side
    421.98x = 185,282.98
  5. Step 5: Solve for x
    x = 185,282.98/421.98
  6. Step 6: Final answer
    x = 439.08

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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.