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Finding the Fourth Proportional to 628.29, 866.28 and 392.16

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Solution

The fourth proportional to 628.29, 866.28 and 392.16 is: 540.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.29 : 866.28 = 392.16 : x
  2. Step 2: Convert to fraction form
    628.29/866.28 = 392.16/x
  3. Step 3: Cross multiply
    628.29x = 866.28 × 392.16
  4. Step 4: Simplify right side
    628.29x = 339,720.36
  5. Step 5: Solve for x
    x = 339,720.36/628.29
  6. Step 6: Final answer
    x = 540.71

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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.