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Finding the Fourth Proportional to 3,593.80, 5,390.93 and 1,128.72

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Solution

The fourth proportional to 3,593.80, 5,390.93 and 1,128.72 is: 1,693.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,593.80 : 5,390.93 = 1,128.72 : x
  2. Step 2: Convert to fraction form
    3,593.80/5,390.93 = 1,128.72/x
  3. Step 3: Cross multiply
    3,593.80x = 5,390.93 × 1,128.72
  4. Step 4: Simplify right side
    3,593.80x = 6,084,850.51
  5. Step 5: Solve for x
    x = 6,084,850.51/3,593.80
  6. Step 6: Final answer
    x = 1,693.15

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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.