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Finding the Fourth Proportional to 811.76, 1,215.20 and 486.14

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Solution

The fourth proportional to 811.76, 1,215.20 and 486.14 is: 727.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.76 : 1,215.20 = 486.14 : x
  2. Step 2: Convert to fraction form
    811.76/1,215.20 = 486.14/x
  3. Step 3: Cross multiply
    811.76x = 1,215.20 × 486.14
  4. Step 4: Simplify right side
    811.76x = 590,752.47
  5. Step 5: Solve for x
    x = 590,752.47/811.76
  6. Step 6: Final answer
    x = 727.75

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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.