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Finding the Fourth Proportional to 287.03, 430.56 and 81.61

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Solution

The fourth proportional to 287.03, 430.56 and 81.61 is: 122.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.03 : 430.56 = 81.61 : x
  2. Step 2: Convert to fraction form
    287.03/430.56 = 81.61/x
  3. Step 3: Cross multiply
    287.03x = 430.56 × 81.61
  4. Step 4: Simplify right side
    287.03x = 35,136.93
  5. Step 5: Solve for x
    x = 35,136.93/287.03
  6. Step 6: Final answer
    x = 122.41

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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.