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Finding the Fourth Proportional to 505.19, 697.18 and 308.60

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Solution

The fourth proportional to 505.19, 697.18 and 308.60 is: 425.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.19 : 697.18 = 308.60 : x
  2. Step 2: Convert to fraction form
    505.19/697.18 = 308.60/x
  3. Step 3: Cross multiply
    505.19x = 697.18 × 308.60
  4. Step 4: Simplify right side
    505.19x = 215,146.26
  5. Step 5: Solve for x
    x = 215,146.26/505.19
  6. Step 6: Final answer
    x = 425.87

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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.