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Finding the Fourth Proportional to 628.25, 866.75 and 392.13

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Solution

The fourth proportional to 628.25, 866.75 and 392.13 is: 540.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.25 : 866.75 = 392.13 : x
  2. Step 2: Convert to fraction form
    628.25/866.75 = 392.13/x
  3. Step 3: Cross multiply
    628.25x = 866.75 × 392.13
  4. Step 4: Simplify right side
    628.25x = 339,876.72
  5. Step 5: Solve for x
    x = 339,876.72/628.25
  6. Step 6: Final answer
    x = 540.99

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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.