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Finding the Fourth Proportional to 103.05, 142.20 and 70.29

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Solution

The fourth proportional to 103.05, 142.20 and 70.29 is: 96.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.05 : 142.20 = 70.29 : x
  2. Step 2: Convert to fraction form
    103.05/142.20 = 70.29/x
  3. Step 3: Cross multiply
    103.05x = 142.20 × 70.29
  4. Step 4: Simplify right side
    103.05x = 9,995.24
  5. Step 5: Solve for x
    x = 9,995.24/103.05
  6. Step 6: Final answer
    x = 96.99

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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.