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Finding the Fourth Proportional to 505.45, 697.54 and 306.35

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Solution

The fourth proportional to 505.45, 697.54 and 306.35 is: 422.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.45 : 697.54 = 306.35 : x
  2. Step 2: Convert to fraction form
    505.45/697.54 = 306.35/x
  3. Step 3: Cross multiply
    505.45x = 697.54 × 306.35
  4. Step 4: Simplify right side
    505.45x = 213,691.38
  5. Step 5: Solve for x
    x = 213,691.38/505.45
  6. Step 6: Final answer
    x = 422.77

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1.5x scale

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.