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Finding the Fourth Proportional to 1,200.76, 1,801.50 and 812.32

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Solution

The fourth proportional to 1,200.76, 1,801.50 and 812.32 is: 1,218.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.76 : 1,801.50 = 812.32 : x
  2. Step 2: Convert to fraction form
    1,200.76/1,801.50 = 812.32/x
  3. Step 3: Cross multiply
    1,200.76x = 1,801.50 × 812.32
  4. Step 4: Simplify right side
    1,200.76x = 1,463,394.48
  5. Step 5: Solve for x
    x = 1,463,394.48/1,200.76
  6. Step 6: Final answer
    x = 1,218.72

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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.