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Finding the Fourth Proportional to 505.57, 697.74 and 306.46

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Solution

The fourth proportional to 505.57, 697.74 and 306.46 is: 422.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.57 : 697.74 = 306.46 : x
  2. Step 2: Convert to fraction form
    505.57/697.74 = 306.46/x
  3. Step 3: Cross multiply
    505.57x = 697.74 × 306.46
  4. Step 4: Simplify right side
    505.57x = 213,829.40
  5. Step 5: Solve for x
    x = 213,829.40/505.57
  6. Step 6: Final answer
    x = 422.95

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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.