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Finding the Fourth Proportional to 505.63, 697.81 and 306.51

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Solution

The fourth proportional to 505.63, 697.81 and 306.51 is: 423.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.63 : 697.81 = 306.51 : x
  2. Step 2: Convert to fraction form
    505.63/697.81 = 306.51/x
  3. Step 3: Cross multiply
    505.63x = 697.81 × 306.51
  4. Step 4: Simplify right side
    505.63x = 213,885.74
  5. Step 5: Solve for x
    x = 213,885.74/505.63
  6. Step 6: Final answer
    x = 423.01

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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.