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Finding the Fourth Proportional to 505.87, 698.38 and 328.99

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Solution

The fourth proportional to 505.87, 698.38 and 328.99 is: 454.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.87 : 698.38 = 328.99 : x
  2. Step 2: Convert to fraction form
    505.87/698.38 = 328.99/x
  3. Step 3: Cross multiply
    505.87x = 698.38 × 328.99
  4. Step 4: Simplify right side
    505.87x = 229,760.04
  5. Step 5: Solve for x
    x = 229,760.04/505.87
  6. Step 6: Final answer
    x = 454.19

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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.