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Finding the Fourth Proportional to 1,278.66, 1,918.53 and 700.86

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Solution

The fourth proportional to 1,278.66, 1,918.53 and 700.86 is: 1,051.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.66 : 1,918.53 = 700.86 : x
  2. Step 2: Convert to fraction form
    1,278.66/1,918.53 = 700.86/x
  3. Step 3: Cross multiply
    1,278.66x = 1,918.53 × 700.86
  4. Step 4: Simplify right side
    1,278.66x = 1,344,620.94
  5. Step 5: Solve for x
    x = 1,344,620.94/1,278.66
  6. Step 6: Final answer
    x = 1,051.59

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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.