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Finding the Fourth Proportional to 1,071.72, 1,608.12 and 495

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Solution

The fourth proportional to 1,071.72, 1,608.12 and 495 is: 742.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.72 : 1,608.12 = 495 : x
  2. Step 2: Convert to fraction form
    1,071.72/1,608.12 = 495/x
  3. Step 3: Cross multiply
    1,071.72x = 1,608.12 × 495
  4. Step 4: Simplify right side
    1,071.72x = 796,019.40
  5. Step 5: Solve for x
    x = 796,019.40/1,071.72
  6. Step 6: Final answer
    x = 742.75

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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.