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Finding the Fourth Proportional to 821.81, 1,134.41 and 511.25

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Solution

The fourth proportional to 821.81, 1,134.41 and 511.25 is: 705.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.81 : 1,134.41 = 511.25 : x
  2. Step 2: Convert to fraction form
    821.81/1,134.41 = 511.25/x
  3. Step 3: Cross multiply
    821.81x = 1,134.41 × 511.25
  4. Step 4: Simplify right side
    821.81x = 579,964.56
  5. Step 5: Solve for x
    x = 579,964.56/821.81
  6. Step 6: Final answer
    x = 705.72

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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.