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Finding the Fourth Proportional to 72.81, 100.45 and 45.17

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Solution

The fourth proportional to 72.81, 100.45 and 45.17 is: 62.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.81 : 100.45 = 45.17 : x
  2. Step 2: Convert to fraction form
    72.81/100.45 = 45.17/x
  3. Step 3: Cross multiply
    72.81x = 100.45 × 45.17
  4. Step 4: Simplify right side
    72.81x = 4,537.33
  5. Step 5: Solve for x
    x = 4,537.33/72.81
  6. Step 6: Final answer
    x = 62.32

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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.