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Finding the Fourth Proportional to 1,271.62, 1,908.42 and 613.63

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Solution

The fourth proportional to 1,271.62, 1,908.42 and 613.63 is: 920.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.62 : 1,908.42 = 613.63 : x
  2. Step 2: Convert to fraction form
    1,271.62/1,908.42 = 613.63/x
  3. Step 3: Cross multiply
    1,271.62x = 1,908.42 × 613.63
  4. Step 4: Simplify right side
    1,271.62x = 1,171,063.76
  5. Step 5: Solve for x
    x = 1,171,063.76/1,271.62
  6. Step 6: Final answer
    x = 920.92

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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.