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Finding the Fourth Proportional to 856.56, 1,182.11 and 646.36

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Solution

The fourth proportional to 856.56, 1,182.11 and 646.36 is: 892.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.56 : 1,182.11 = 646.36 : x
  2. Step 2: Convert to fraction form
    856.56/1,182.11 = 646.36/x
  3. Step 3: Cross multiply
    856.56x = 1,182.11 × 646.36
  4. Step 4: Simplify right side
    856.56x = 764,068.62
  5. Step 5: Solve for x
    x = 764,068.62/856.56
  6. Step 6: Final answer
    x = 892.02

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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.