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Finding the Fourth Proportional to 421.66, 582.15 and 282.07

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Solution

The fourth proportional to 421.66, 582.15 and 282.07 is: 389.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.66 : 582.15 = 282.07 : x
  2. Step 2: Convert to fraction form
    421.66/582.15 = 282.07/x
  3. Step 3: Cross multiply
    421.66x = 582.15 × 282.07
  4. Step 4: Simplify right side
    421.66x = 164,207.05
  5. Step 5: Solve for x
    x = 164,207.05/421.66
  6. Step 6: Final answer
    x = 389.43

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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.