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Finding the Fourth Proportional to 579.52, 868.90 and 386.76

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Solution

The fourth proportional to 579.52, 868.90 and 386.76 is: 579.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.52 : 868.90 = 386.76 : x
  2. Step 2: Convert to fraction form
    579.52/868.90 = 386.76/x
  3. Step 3: Cross multiply
    579.52x = 868.90 × 386.76
  4. Step 4: Simplify right side
    579.52x = 336,055.76
  5. Step 5: Solve for x
    x = 336,055.76/579.52
  6. Step 6: Final answer
    x = 579.89

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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.