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Finding the Fourth Proportional to 999.24, 1,377.72 and 821.58

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Solution

The fourth proportional to 999.24, 1,377.72 and 821.58 is: 1,132.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.24 : 1,377.72 = 821.58 : x
  2. Step 2: Convert to fraction form
    999.24/1,377.72 = 821.58/x
  3. Step 3: Cross multiply
    999.24x = 1,377.72 × 821.58
  4. Step 4: Simplify right side
    999.24x = 1,131,907.20
  5. Step 5: Solve for x
    x = 1,131,907.20/999.24
  6. Step 6: Final answer
    x = 1,132.77

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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.