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Finding the Fourth Proportional to 850.50, 1,172.97 and 780.66

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Solution

The fourth proportional to 850.50, 1,172.97 and 780.66 is: 1,076.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.50 : 1,172.97 = 780.66 : x
  2. Step 2: Convert to fraction form
    850.50/1,172.97 = 780.66/x
  3. Step 3: Cross multiply
    850.50x = 1,172.97 × 780.66
  4. Step 4: Simplify right side
    850.50x = 915,690.76
  5. Step 5: Solve for x
    x = 915,690.76/850.50
  6. Step 6: Final answer
    x = 1,076.65

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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.