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Finding the Fourth Proportional to 781.98, 1,172.97 and 204.86

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Solution

The fourth proportional to 781.98, 1,172.97 and 204.86 is: 307.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.98 : 1,172.97 = 204.86 : x
  2. Step 2: Convert to fraction form
    781.98/1,172.97 = 204.86/x
  3. Step 3: Cross multiply
    781.98x = 1,172.97 × 204.86
  4. Step 4: Simplify right side
    781.98x = 240,288.77
  5. Step 5: Solve for x
    x = 240,288.77/781.98
  6. Step 6: Final answer
    x = 307.28

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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.