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Finding the Fourth Proportional to 1,200.57, 1,800.70 and 378.93

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Solution

The fourth proportional to 1,200.57, 1,800.70 and 378.93 is: 568.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.57 : 1,800.70 = 378.93 : x
  2. Step 2: Convert to fraction form
    1,200.57/1,800.70 = 378.93/x
  3. Step 3: Cross multiply
    1,200.57x = 1,800.70 × 378.93
  4. Step 4: Simplify right side
    1,200.57x = 682,330.25
  5. Step 5: Solve for x
    x = 682,330.25/1,200.57
  6. Step 6: Final answer
    x = 568.34

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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.