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Finding the Fourth Proportional to 1,381.66, 2,069.60 and 861.92

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Solution

The fourth proportional to 1,381.66, 2,069.60 and 861.92 is: 1,291.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.66 : 2,069.60 = 861.92 : x
  2. Step 2: Convert to fraction form
    1,381.66/2,069.60 = 861.92/x
  3. Step 3: Cross multiply
    1,381.66x = 2,069.60 × 861.92
  4. Step 4: Simplify right side
    1,381.66x = 1,783,829.63
  5. Step 5: Solve for x
    x = 1,783,829.63/1,381.66
  6. Step 6: Final answer
    x = 1,291.08

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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.