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Finding the Fourth Proportional to 579.42, 869.21 and 305.53

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Solution

The fourth proportional to 579.42, 869.21 and 305.53 is: 458.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.42 : 869.21 = 305.53 : x
  2. Step 2: Convert to fraction form
    579.42/869.21 = 305.53/x
  3. Step 3: Cross multiply
    579.42x = 869.21 × 305.53
  4. Step 4: Simplify right side
    579.42x = 265,569.73
  5. Step 5: Solve for x
    x = 265,569.73/579.42
  6. Step 6: Final answer
    x = 458.34

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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.