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Finding the Fourth Proportional to 1,381.12, 1,905.12 and 856.96

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Solution

The fourth proportional to 1,381.12, 1,905.12 and 856.96 is: 1,182.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.12 : 1,905.12 = 856.96 : x
  2. Step 2: Convert to fraction form
    1,381.12/1,905.12 = 856.96/x
  3. Step 3: Cross multiply
    1,381.12x = 1,905.12 × 856.96
  4. Step 4: Simplify right side
    1,381.12x = 1,632,611.64
  5. Step 5: Solve for x
    x = 1,632,611.64/1,381.12
  6. Step 6: Final answer
    x = 1,182.09

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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.