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Finding the Fourth Proportional to 104.13, 143.64 and 72.99

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Solution

The fourth proportional to 104.13, 143.64 and 72.99 is: 100.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.13 : 143.64 = 72.99 : x
  2. Step 2: Convert to fraction form
    104.13/143.64 = 72.99/x
  3. Step 3: Cross multiply
    104.13x = 143.64 × 72.99
  4. Step 4: Simplify right side
    104.13x = 10,484.28
  5. Step 5: Solve for x
    x = 10,484.28/104.13
  6. Step 6: Final answer
    x = 100.68

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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.