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Finding the Fourth Proportional to 287.09, 430.28 and 132.80

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Solution

The fourth proportional to 287.09, 430.28 and 132.80 is: 199.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.09 : 430.28 = 132.80 : x
  2. Step 2: Convert to fraction form
    287.09/430.28 = 132.80/x
  3. Step 3: Cross multiply
    287.09x = 430.28 × 132.80
  4. Step 4: Simplify right side
    287.09x = 57,141.60
  5. Step 5: Solve for x
    x = 57,141.60/287.09
  6. Step 6: Final answer
    x = 199.04

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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.