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Finding the Fourth Proportional to 781.63, 1,172.46 and 204.51

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Solution

The fourth proportional to 781.63, 1,172.46 and 204.51 is: 306.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.63 : 1,172.46 = 204.51 : x
  2. Step 2: Convert to fraction form
    781.63/1,172.46 = 204.51/x
  3. Step 3: Cross multiply
    781.63x = 1,172.46 × 204.51
  4. Step 4: Simplify right side
    781.63x = 239,772.91
  5. Step 5: Solve for x
    x = 239,772.91/781.63
  6. Step 6: Final answer
    x = 306.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.