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Finding the Fourth Proportional to 1,381.01, 1,905.21 and 856.13

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Solution

The fourth proportional to 1,381.01, 1,905.21 and 856.13 is: 1,181.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.01 : 1,905.21 = 856.13 : x
  2. Step 2: Convert to fraction form
    1,381.01/1,905.21 = 856.13/x
  3. Step 3: Cross multiply
    1,381.01x = 1,905.21 × 856.13
  4. Step 4: Simplify right side
    1,381.01x = 1,631,097.91
  5. Step 5: Solve for x
    x = 1,631,097.91/1,381.01
  6. Step 6: Final answer
    x = 1,181.09

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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.