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Finding the Fourth Proportional to 287.42, 431.10 and 133.34

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Solution

The fourth proportional to 287.42, 431.10 and 133.34 is: 199.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.42 : 431.10 = 133.34 : x
  2. Step 2: Convert to fraction form
    287.42/431.10 = 133.34/x
  3. Step 3: Cross multiply
    287.42x = 431.10 × 133.34
  4. Step 4: Simplify right side
    287.42x = 57,480.72
  5. Step 5: Solve for x
    x = 57,480.72/287.42
  6. Step 6: Final answer
    x = 199.99

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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.