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Finding the Fourth Proportional to 628.22, 866.76 and 428.69

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Solution

The fourth proportional to 628.22, 866.76 and 428.69 is: 591.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.22 : 866.76 = 428.69 : x
  2. Step 2: Convert to fraction form
    628.22/866.76 = 428.69/x
  3. Step 3: Cross multiply
    628.22x = 866.76 × 428.69
  4. Step 4: Simplify right side
    628.22x = 371,567.01
  5. Step 5: Solve for x
    x = 371,567.01/628.22
  6. Step 6: Final answer
    x = 591.46

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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.