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Finding the Fourth Proportional to 505.79, 754.91 and 439.62

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Solution

The fourth proportional to 505.79, 754.91 and 439.62 is: 656.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.79 : 754.91 = 439.62 : x
  2. Step 2: Convert to fraction form
    505.79/754.91 = 439.62/x
  3. Step 3: Cross multiply
    505.79x = 754.91 × 439.62
  4. Step 4: Simplify right side
    505.79x = 331,873.53
  5. Step 5: Solve for x
    x = 331,873.53/505.79
  6. Step 6: Final answer
    x = 656.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.