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Finding the Fourth Proportional to 1,278.86, 1,764.59 and 859.88

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Solution

The fourth proportional to 1,278.86, 1,764.59 and 859.88 is: 1,186.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.86 : 1,764.59 = 859.88 : x
  2. Step 2: Convert to fraction form
    1,278.86/1,764.59 = 859.88/x
  3. Step 3: Cross multiply
    1,278.86x = 1,764.59 × 859.88
  4. Step 4: Simplify right side
    1,278.86x = 1,517,335.76
  5. Step 5: Solve for x
    x = 1,517,335.76/1,278.86
  6. Step 6: Final answer
    x = 1,186.48

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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.