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Finding the Fourth Proportional to 819.84, 1,131.21 and 505.16

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Solution

The fourth proportional to 819.84, 1,131.21 and 505.16 is: 697.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.84 : 1,131.21 = 505.16 : x
  2. Step 2: Convert to fraction form
    819.84/1,131.21 = 505.16/x
  3. Step 3: Cross multiply
    819.84x = 1,131.21 × 505.16
  4. Step 4: Simplify right side
    819.84x = 571,436.39
  5. Step 5: Solve for x
    x = 571,436.39/819.84
  6. Step 6: Final answer
    x = 697.01

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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.