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Finding the Fourth Proportional to 505.71, 697.86 and 281.66

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Solution

The fourth proportional to 505.71, 697.86 and 281.66 is: 388.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.71 : 697.86 = 281.66 : x
  2. Step 2: Convert to fraction form
    505.71/697.86 = 281.66/x
  3. Step 3: Cross multiply
    505.71x = 697.86 × 281.66
  4. Step 4: Simplify right side
    505.71x = 196,559.25
  5. Step 5: Solve for x
    x = 196,559.25/505.71
  6. Step 6: Final answer
    x = 388.68

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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.