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Finding the Fourth Proportional to 1,278.65, 1,764.48 and 719.11

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Solution

The fourth proportional to 1,278.65, 1,764.48 and 719.11 is: 992.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.65 : 1,764.48 = 719.11 : x
  2. Step 2: Convert to fraction form
    1,278.65/1,764.48 = 719.11/x
  3. Step 3: Cross multiply
    1,278.65x = 1,764.48 × 719.11
  4. Step 4: Simplify right side
    1,278.65x = 1,268,860.12
  5. Step 5: Solve for x
    x = 1,268,860.12/1,278.65
  6. Step 6: Final answer
    x = 992.34

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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.