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Finding the Fourth Proportional to 287.30, 431.26 and 229.86

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Solution

The fourth proportional to 287.30, 431.26 and 229.86 is: 345.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.30 : 431.26 = 229.86 : x
  2. Step 2: Convert to fraction form
    287.30/431.26 = 229.86/x
  3. Step 3: Cross multiply
    287.30x = 431.26 × 229.86
  4. Step 4: Simplify right side
    287.30x = 99,128.85
  5. Step 5: Solve for x
    x = 99,128.85/287.30
  6. Step 6: Final answer
    x = 345.03

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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.