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Finding the Fourth Proportional to 579.31, 869.72 and 345.47

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Solution

The fourth proportional to 579.31, 869.72 and 345.47 is: 518.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.31 : 869.72 = 345.47 : x
  2. Step 2: Convert to fraction form
    579.31/869.72 = 345.47/x
  3. Step 3: Cross multiply
    579.31x = 869.72 × 345.47
  4. Step 4: Simplify right side
    579.31x = 300,465.21
  5. Step 5: Solve for x
    x = 300,465.21/579.31
  6. Step 6: Final answer
    x = 518.66

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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.