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Finding the Fourth Proportional to 103.59, 143.28 and 92.10

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Solution

The fourth proportional to 103.59, 143.28 and 92.10 is: 127.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.59 : 143.28 = 92.10 : x
  2. Step 2: Convert to fraction form
    103.59/143.28 = 92.10/x
  3. Step 3: Cross multiply
    103.59x = 143.28 × 92.10
  4. Step 4: Simplify right side
    103.59x = 13,196.09
  5. Step 5: Solve for x
    x = 13,196.09/103.59
  6. Step 6: Final answer
    x = 127.39

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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.