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Finding the Fourth Proportional to 682.18, 1,021.65 and 392.74

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Solution

The fourth proportional to 682.18, 1,021.65 and 392.74 is: 588.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.18 : 1,021.65 = 392.74 : x
  2. Step 2: Convert to fraction form
    682.18/1,021.65 = 392.74/x
  3. Step 3: Cross multiply
    682.18x = 1,021.65 × 392.74
  4. Step 4: Simplify right side
    682.18x = 401,242.82
  5. Step 5: Solve for x
    x = 401,242.82/682.18
  6. Step 6: Final answer
    x = 588.18

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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.