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Finding the Fourth Proportional to 821.37, 1,133.90 and 506.89

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Solution

The fourth proportional to 821.37, 1,133.90 and 506.89 is: 699.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.37 : 1,133.90 = 506.89 : x
  2. Step 2: Convert to fraction form
    821.37/1,133.90 = 506.89/x
  3. Step 3: Cross multiply
    821.37x = 1,133.90 × 506.89
  4. Step 4: Simplify right side
    821.37x = 574,763.35
  5. Step 5: Solve for x
    x = 574,763.35/821.37
  6. Step 6: Final answer
    x = 699.76

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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.