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Finding the Fourth Proportional to 103.02, 142.26 and 86.41

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Solution

The fourth proportional to 103.02, 142.26 and 86.41 is: 119.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.02 : 142.26 = 86.41 : x
  2. Step 2: Convert to fraction form
    103.02/142.26 = 86.41/x
  3. Step 3: Cross multiply
    103.02x = 142.26 × 86.41
  4. Step 4: Simplify right side
    103.02x = 12,292.69
  5. Step 5: Solve for x
    x = 12,292.69/103.02
  6. Step 6: Final answer
    x = 119.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.