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Finding the Fourth Proportional to 1,385.65, 1,912.40 and 854.62

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Solution

The fourth proportional to 1,385.65, 1,912.40 and 854.62 is: 1,179.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.65 : 1,912.40 = 854.62 : x
  2. Step 2: Convert to fraction form
    1,385.65/1,912.40 = 854.62/x
  3. Step 3: Cross multiply
    1,385.65x = 1,912.40 × 854.62
  4. Step 4: Simplify right side
    1,385.65x = 1,634,375.29
  5. Step 5: Solve for x
    x = 1,634,375.29/1,385.65
  6. Step 6: Final answer
    x = 1,179.50

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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.