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Finding the Fourth Proportional to 505.13, 697.08 and 308.60

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Solution

The fourth proportional to 505.13, 697.08 and 308.60 is: 425.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.13 : 697.08 = 308.60 : x
  2. Step 2: Convert to fraction form
    505.13/697.08 = 308.60/x
  3. Step 3: Cross multiply
    505.13x = 697.08 × 308.60
  4. Step 4: Simplify right side
    505.13x = 215,115.40
  5. Step 5: Solve for x
    x = 215,115.40/505.13
  6. Step 6: Final answer
    x = 425.87

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.