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Finding the Fourth Proportional to 1,100.80, 1,650.32 and 553.20

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Solution

The fourth proportional to 1,100.80, 1,650.32 and 553.20 is: 829.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,100.80 : 1,650.32 = 553.20 : x
  2. Step 2: Convert to fraction form
    1,100.80/1,650.32 = 553.20/x
  3. Step 3: Cross multiply
    1,100.80x = 1,650.32 × 553.20
  4. Step 4: Simplify right side
    1,100.80x = 912,957.02
  5. Step 5: Solve for x
    x = 912,957.02/1,100.80
  6. Step 6: Final answer
    x = 829.36

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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.