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Finding the Fourth Proportional to 505.09, 697.26 and 308.53

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Solution

The fourth proportional to 505.09, 697.26 and 308.53 is: 425.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.09 : 697.26 = 308.53 : x
  2. Step 2: Convert to fraction form
    505.09/697.26 = 308.53/x
  3. Step 3: Cross multiply
    505.09x = 697.26 × 308.53
  4. Step 4: Simplify right side
    505.09x = 215,125.63
  5. Step 5: Solve for x
    x = 215,125.63/505.09
  6. Step 6: Final answer
    x = 425.92

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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.