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Finding the Fourth Proportional to 287.92, 431.34 and 143.74

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Solution

The fourth proportional to 287.92, 431.34 and 143.74 is: 215.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.92 : 431.34 = 143.74 : x
  2. Step 2: Convert to fraction form
    287.92/431.34 = 143.74/x
  3. Step 3: Cross multiply
    287.92x = 431.34 × 143.74
  4. Step 4: Simplify right side
    287.92x = 62,000.81
  5. Step 5: Solve for x
    x = 62,000.81/287.92
  6. Step 6: Final answer
    x = 215.34

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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.