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Finding the Fourth Proportional to 287.98, 431.72 and 141.66

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Solution

The fourth proportional to 287.98, 431.72 and 141.66 is: 212.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.98 : 431.72 = 141.66 : x
  2. Step 2: Convert to fraction form
    287.98/431.72 = 141.66/x
  3. Step 3: Cross multiply
    287.98x = 431.72 × 141.66
  4. Step 4: Simplify right side
    287.98x = 61,157.46
  5. Step 5: Solve for x
    x = 61,157.46/287.98
  6. Step 6: Final answer
    x = 212.37

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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.