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Finding the Fourth Proportional to 1,053.75, 1,578.60 and 821.55

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Solution

The fourth proportional to 1,053.75, 1,578.60 and 821.55 is: 1,230.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,053.75 : 1,578.60 = 821.55 : x
  2. Step 2: Convert to fraction form
    1,053.75/1,578.60 = 821.55/x
  3. Step 3: Cross multiply
    1,053.75x = 1,578.60 × 821.55
  4. Step 4: Simplify right side
    1,053.75x = 1,296,898.83
  5. Step 5: Solve for x
    x = 1,296,898.83/1,053.75
  6. Step 6: Final answer
    x = 1,230.75

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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.