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Finding the Fourth Proportional to 421.66, 582.07 and 283.74

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Solution

The fourth proportional to 421.66, 582.07 and 283.74 is: 391.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.66 : 582.07 = 283.74 : x
  2. Step 2: Convert to fraction form
    421.66/582.07 = 283.74/x
  3. Step 3: Cross multiply
    421.66x = 582.07 × 283.74
  4. Step 4: Simplify right side
    421.66x = 165,156.54
  5. Step 5: Solve for x
    x = 165,156.54/421.66
  6. Step 6: Final answer
    x = 391.68

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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.