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Finding the Fourth Proportional to 142.08, 213.54 and 69.99

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Solution

The fourth proportional to 142.08, 213.54 and 69.99 is: 105.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.08 : 213.54 = 69.99 : x
  2. Step 2: Convert to fraction form
    142.08/213.54 = 69.99/x
  3. Step 3: Cross multiply
    142.08x = 213.54 × 69.99
  4. Step 4: Simplify right side
    142.08x = 14,945.66
  5. Step 5: Solve for x
    x = 14,945.66/142.08
  6. Step 6: Final answer
    x = 105.19

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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.