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Finding the Fourth Proportional to 287.94, 431.91 and 143.76

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Solution

The fourth proportional to 287.94, 431.91 and 143.76 is: 215.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.94 : 431.91 = 143.76 : x
  2. Step 2: Convert to fraction form
    287.94/431.91 = 143.76/x
  3. Step 3: Cross multiply
    287.94x = 431.91 × 143.76
  4. Step 4: Simplify right side
    287.94x = 62,091.38
  5. Step 5: Solve for x
    x = 62,091.38/287.94
  6. Step 6: Final answer
    x = 215.64

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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.