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Finding the Fourth Proportional to 505.42, 697.53 and 308.95

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Solution

The fourth proportional to 505.42, 697.53 and 308.95 is: 426.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.42 : 697.53 = 308.95 : x
  2. Step 2: Convert to fraction form
    505.42/697.53 = 308.95/x
  3. Step 3: Cross multiply
    505.42x = 697.53 × 308.95
  4. Step 4: Simplify right side
    505.42x = 215,501.89
  5. Step 5: Solve for x
    x = 215,501.89/505.42
  6. Step 6: Final answer
    x = 426.38

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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.