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Finding the Fourth Proportional to 1,357.21, 1,872.96 and 767.71

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Solution

The fourth proportional to 1,357.21, 1,872.96 and 767.71 is: 1,059.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,357.21 : 1,872.96 = 767.71 : x
  2. Step 2: Convert to fraction form
    1,357.21/1,872.96 = 767.71/x
  3. Step 3: Cross multiply
    1,357.21x = 1,872.96 × 767.71
  4. Step 4: Simplify right side
    1,357.21x = 1,437,890.12
  5. Step 5: Solve for x
    x = 1,437,890.12/1,357.21
  6. Step 6: Final answer
    x = 1,059.45

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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.