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Finding the Fourth Proportional to 856.72, 1,287.14 and 549.17

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Solution

The fourth proportional to 856.72, 1,287.14 and 549.17 is: 825.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.72 : 1,287.14 = 549.17 : x
  2. Step 2: Convert to fraction form
    856.72/1,287.14 = 549.17/x
  3. Step 3: Cross multiply
    856.72x = 1,287.14 × 549.17
  4. Step 4: Simplify right side
    856.72x = 706,861.56
  5. Step 5: Solve for x
    x = 706,861.56/856.72
  6. Step 6: Final answer
    x = 825.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.