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Finding the Fourth Proportional to 1,291.67, 1,782.51 and 767.69

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Solution

The fourth proportional to 1,291.67, 1,782.51 and 767.69 is: 1,059.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.67 : 1,782.51 = 767.69 : x
  2. Step 2: Convert to fraction form
    1,291.67/1,782.51 = 767.69/x
  3. Step 3: Cross multiply
    1,291.67x = 1,782.51 × 767.69
  4. Step 4: Simplify right side
    1,291.67x = 1,368,415.10
  5. Step 5: Solve for x
    x = 1,368,415.10/1,291.67
  6. Step 6: Final answer
    x = 1,059.42

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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.