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Finding the Fourth Proportional to 288, 431.40 and 141.57

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Solution

The fourth proportional to 288, 431.40 and 141.57 is: 212.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    288 : 431.40 = 141.57 : x
  2. Step 2: Convert to fraction form
    288/431.40 = 141.57/x
  3. Step 3: Cross multiply
    288x = 431.40 × 141.57
  4. Step 4: Simplify right side
    288x = 61,073.30
  5. Step 5: Solve for x
    x = 61,073.30/288
  6. Step 6: Final answer
    x = 212.06

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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.