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Finding the Fourth Proportional to 505.89, 698.36 and 389.25

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Solution

The fourth proportional to 505.89, 698.36 and 389.25 is: 537.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.89 : 698.36 = 389.25 : x
  2. Step 2: Convert to fraction form
    505.89/698.36 = 389.25/x
  3. Step 3: Cross multiply
    505.89x = 698.36 × 389.25
  4. Step 4: Simplify right side
    505.89x = 271,834.68
  5. Step 5: Solve for x
    x = 271,834.68/505.89
  6. Step 6: Final answer
    x = 537.34

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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.