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Finding the Fourth Proportional to 628.26, 866.79 and 407.49

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Solution

The fourth proportional to 628.26, 866.79 and 407.49 is: 562.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.26 : 866.79 = 407.49 : x
  2. Step 2: Convert to fraction form
    628.26/866.79 = 407.49/x
  3. Step 3: Cross multiply
    628.26x = 866.79 × 407.49
  4. Step 4: Simplify right side
    628.26x = 353,208.26
  5. Step 5: Solve for x
    x = 353,208.26/628.26
  6. Step 6: Final answer
    x = 562.20

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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.