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Finding the Fourth Proportional to 856.13, 1,181.49 and 483.20

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Solution

The fourth proportional to 856.13, 1,181.49 and 483.20 is: 666.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.13 : 1,181.49 = 483.20 : x
  2. Step 2: Convert to fraction form
    856.13/1,181.49 = 483.20/x
  3. Step 3: Cross multiply
    856.13x = 1,181.49 × 483.20
  4. Step 4: Simplify right side
    856.13x = 570,895.97
  5. Step 5: Solve for x
    x = 570,895.97/856.13
  6. Step 6: Final answer
    x = 666.83

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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.