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Finding the Fourth Proportional to 872.98, 1,308.56 and 386.37

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Solution

The fourth proportional to 872.98, 1,308.56 and 386.37 is: 579.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.98 : 1,308.56 = 386.37 : x
  2. Step 2: Convert to fraction form
    872.98/1,308.56 = 386.37/x
  3. Step 3: Cross multiply
    872.98x = 1,308.56 × 386.37
  4. Step 4: Simplify right side
    872.98x = 505,586.40
  5. Step 5: Solve for x
    x = 505,586.40/872.98
  6. Step 6: Final answer
    x = 579.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.