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Finding the Fourth Proportional to 505.00, 696.95 and 308.64

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Solution

The fourth proportional to 505.00, 696.95 and 308.64 is: 425.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.00 : 696.95 = 308.64 : x
  2. Step 2: Convert to fraction form
    505.00/696.95 = 308.64/x
  3. Step 3: Cross multiply
    505.00x = 696.95 × 308.64
  4. Step 4: Simplify right side
    505.00x = 215,110.61
  5. Step 5: Solve for x
    x = 215,110.61/505.00
  6. Step 6: Final answer
    x = 425.96

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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.