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Finding the Fourth Proportional to 811.69, 1,215.58 and 463.97

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Solution

The fourth proportional to 811.69, 1,215.58 and 463.97 is: 694.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.69 : 1,215.58 = 463.97 : x
  2. Step 2: Convert to fraction form
    811.69/1,215.58 = 463.97/x
  3. Step 3: Cross multiply
    811.69x = 1,215.58 × 463.97
  4. Step 4: Simplify right side
    811.69x = 563,993.94
  5. Step 5: Solve for x
    x = 563,993.94/811.69
  6. Step 6: Final answer
    x = 694.84

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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.