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Finding the Fourth Proportional to 628.49, 866.84 and 557.69

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Solution

The fourth proportional to 628.49, 866.84 and 557.69 is: 769.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.49 : 866.84 = 557.69 : x
  2. Step 2: Convert to fraction form
    628.49/866.84 = 557.69/x
  3. Step 3: Cross multiply
    628.49x = 866.84 × 557.69
  4. Step 4: Simplify right side
    628.49x = 483,425.21
  5. Step 5: Solve for x
    x = 483,425.21/628.49
  6. Step 6: Final answer
    x = 769.19

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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.