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Finding the Fourth Proportional to 1,200.54, 1,801.61 and 431.04

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Solution

The fourth proportional to 1,200.54, 1,801.61 and 431.04 is: 646.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.54 : 1,801.61 = 431.04 : x
  2. Step 2: Convert to fraction form
    1,200.54/1,801.61 = 431.04/x
  3. Step 3: Cross multiply
    1,200.54x = 1,801.61 × 431.04
  4. Step 4: Simplify right side
    1,200.54x = 776,565.97
  5. Step 5: Solve for x
    x = 776,565.97/1,200.54
  6. Step 6: Final answer
    x = 646.85

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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.