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Finding the Fourth Proportional to 1,128.80, 1,693.54 and 800.37

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Solution

The fourth proportional to 1,128.80, 1,693.54 and 800.37 is: 1,200.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.80 : 1,693.54 = 800.37 : x
  2. Step 2: Convert to fraction form
    1,128.80/1,693.54 = 800.37/x
  3. Step 3: Cross multiply
    1,128.80x = 1,693.54 × 800.37
  4. Step 4: Simplify right side
    1,128.80x = 1,355,458.61
  5. Step 5: Solve for x
    x = 1,355,458.61/1,128.80
  6. Step 6: Final answer
    x = 1,200.80

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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.