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Finding the Fourth Proportional to 856.37, 1,181.12 and 561.58

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Solution

The fourth proportional to 856.37, 1,181.12 and 561.58 is: 774.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.37 : 1,181.12 = 561.58 : x
  2. Step 2: Convert to fraction form
    856.37/1,181.12 = 561.58/x
  3. Step 3: Cross multiply
    856.37x = 1,181.12 × 561.58
  4. Step 4: Simplify right side
    856.37x = 663,293.37
  5. Step 5: Solve for x
    x = 663,293.37/856.37
  6. Step 6: Final answer
    x = 774.54

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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.