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Finding the Fourth Proportional to 287.26, 431 and 125.06

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Solution

The fourth proportional to 287.26, 431 and 125.06 is: 187.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.26 : 431 = 125.06 : x
  2. Step 2: Convert to fraction form
    287.26/431 = 125.06/x
  3. Step 3: Cross multiply
    287.26x = 431 × 125.06
  4. Step 4: Simplify right side
    287.26x = 53,900.86
  5. Step 5: Solve for x
    x = 53,900.86/287.26
  6. Step 6: Final answer
    x = 187.64

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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.