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Finding the Fourth Proportional to 856.17, 1,181.64 and 646.58

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Solution

The fourth proportional to 856.17, 1,181.64 and 646.58 is: 892.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.17 : 1,181.64 = 646.58 : x
  2. Step 2: Convert to fraction form
    856.17/1,181.64 = 646.58/x
  3. Step 3: Cross multiply
    856.17x = 1,181.64 × 646.58
  4. Step 4: Simplify right side
    856.17x = 764,018.88
  5. Step 5: Solve for x
    x = 764,018.88/856.17
  6. Step 6: Final answer
    x = 892.37

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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.