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Finding the Fourth Proportional to 850.38, 1,277.40 and 720.65

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Solution

The fourth proportional to 850.38, 1,277.40 and 720.65 is: 1,082.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.38 : 1,277.40 = 720.65 : x
  2. Step 2: Convert to fraction form
    850.38/1,277.40 = 720.65/x
  3. Step 3: Cross multiply
    850.38x = 1,277.40 × 720.65
  4. Step 4: Simplify right side
    850.38x = 920,551.92
  5. Step 5: Solve for x
    x = 920,551.92/850.38
  6. Step 6: Final answer
    x = 1,082.52

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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.