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Finding the Fourth Proportional to 1,357, 1,872.66 and 805

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Solution

The fourth proportional to 1,357, 1,872.66 and 805 is: 1,110.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,357 : 1,872.66 = 805 : x
  2. Step 2: Convert to fraction form
    1,357/1,872.66 = 805/x
  3. Step 3: Cross multiply
    1,357x = 1,872.66 × 805
  4. Step 4: Simplify right side
    1,357x = 1,507,491.30
  5. Step 5: Solve for x
    x = 1,507,491.30/1,357
  6. Step 6: Final answer
    x = 1,110.90

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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.