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Finding the Fourth Proportional to 287.69, 431.57 and 133.59

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Solution

The fourth proportional to 287.69, 431.57 and 133.59 is: 200.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.69 : 431.57 = 133.59 : x
  2. Step 2: Convert to fraction form
    287.69/431.57 = 133.59/x
  3. Step 3: Cross multiply
    287.69x = 431.57 × 133.59
  4. Step 4: Simplify right side
    287.69x = 57,652.77
  5. Step 5: Solve for x
    x = 57,652.77/287.69
  6. Step 6: Final answer
    x = 200.40

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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.