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Finding the Fourth Proportional to 1,381.74, 2,069.82 and 860.46

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Solution

The fourth proportional to 1,381.74, 2,069.82 and 860.46 is: 1,288.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.74 : 2,069.82 = 860.46 : x
  2. Step 2: Convert to fraction form
    1,381.74/2,069.82 = 860.46/x
  3. Step 3: Cross multiply
    1,381.74x = 2,069.82 × 860.46
  4. Step 4: Simplify right side
    1,381.74x = 1,780,997.32
  5. Step 5: Solve for x
    x = 1,780,997.32/1,381.74
  6. Step 6: Final answer
    x = 1,288.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.