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Finding the Fourth Proportional to 1,357.31, 1,872.97 and 767.93

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Solution

The fourth proportional to 1,357.31, 1,872.97 and 767.93 is: 1,059.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,357.31 : 1,872.97 = 767.93 : x
  2. Step 2: Convert to fraction form
    1,357.31/1,872.97 = 767.93/x
  3. Step 3: Cross multiply
    1,357.31x = 1,872.97 × 767.93
  4. Step 4: Simplify right side
    1,357.31x = 1,438,313.42
  5. Step 5: Solve for x
    x = 1,438,313.42/1,357.31
  6. Step 6: Final answer
    x = 1,059.68

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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.