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Finding the Fourth Proportional to 1,273.38, 1,908.72 and 656.43

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Solution

The fourth proportional to 1,273.38, 1,908.72 and 656.43 is: 983.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,273.38 : 1,908.72 = 656.43 : x
  2. Step 2: Convert to fraction form
    1,273.38/1,908.72 = 656.43/x
  3. Step 3: Cross multiply
    1,273.38x = 1,908.72 × 656.43
  4. Step 4: Simplify right side
    1,273.38x = 1,252,941.07
  5. Step 5: Solve for x
    x = 1,252,941.07/1,273.38
  6. Step 6: Final answer
    x = 983.95

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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.