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Finding the Fourth Proportional to 287.46, 431.34 and 143.19

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Solution

The fourth proportional to 287.46, 431.34 and 143.19 is: 214.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.46 : 431.34 = 143.19 : x
  2. Step 2: Convert to fraction form
    287.46/431.34 = 143.19/x
  3. Step 3: Cross multiply
    287.46x = 431.34 × 143.19
  4. Step 4: Simplify right side
    287.46x = 61,763.57
  5. Step 5: Solve for x
    x = 61,763.57/287.46
  6. Step 6: Final answer
    x = 214.86

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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.