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Finding the Fourth Proportional to 856.29, 1,181.65 and 478.19

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Solution

The fourth proportional to 856.29, 1,181.65 and 478.19 is: 659.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.29 : 1,181.65 = 478.19 : x
  2. Step 2: Convert to fraction form
    856.29/1,181.65 = 478.19/x
  3. Step 3: Cross multiply
    856.29x = 1,181.65 × 478.19
  4. Step 4: Simplify right side
    856.29x = 565,053.21
  5. Step 5: Solve for x
    x = 565,053.21/856.29
  6. Step 6: Final answer
    x = 659.89

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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.