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Finding the Fourth Proportional to 856.56, 1,181.79 and 515.91

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Solution

The fourth proportional to 856.56, 1,181.79 and 515.91 is: 711.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.56 : 1,181.79 = 515.91 : x
  2. Step 2: Convert to fraction form
    856.56/1,181.79 = 515.91/x
  3. Step 3: Cross multiply
    856.56x = 1,181.79 × 515.91
  4. Step 4: Simplify right side
    856.56x = 609,697.28
  5. Step 5: Solve for x
    x = 609,697.28/856.56
  6. Step 6: Final answer
    x = 711.80

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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.