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Finding the Fourth Proportional to 811.04, 1,215.60 and 579.68

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Solution

The fourth proportional to 811.04, 1,215.60 and 579.68 is: 868.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.04 : 1,215.60 = 579.68 : x
  2. Step 2: Convert to fraction form
    811.04/1,215.60 = 579.68/x
  3. Step 3: Cross multiply
    811.04x = 1,215.60 × 579.68
  4. Step 4: Simplify right side
    811.04x = 704,659.01
  5. Step 5: Solve for x
    x = 704,659.01/811.04
  6. Step 6: Final answer
    x = 868.83

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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.