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Finding the Fourth Proportional to 1,278.43, 1,764.28 and 718.89

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Solution

The fourth proportional to 1,278.43, 1,764.28 and 718.89 is: 992.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.43 : 1,764.28 = 718.89 : x
  2. Step 2: Convert to fraction form
    1,278.43/1,764.28 = 718.89/x
  3. Step 3: Cross multiply
    1,278.43x = 1,764.28 × 718.89
  4. Step 4: Simplify right side
    1,278.43x = 1,268,323.25
  5. Step 5: Solve for x
    x = 1,268,323.25/1,278.43
  6. Step 6: Final answer
    x = 992.09

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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.