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Finding the Fourth Proportional to 72.79, 100.44 and 45.16

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Solution

The fourth proportional to 72.79, 100.44 and 45.16 is: 62.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.79 : 100.44 = 45.16 : x
  2. Step 2: Convert to fraction form
    72.79/100.44 = 45.16/x
  3. Step 3: Cross multiply
    72.79x = 100.44 × 45.16
  4. Step 4: Simplify right side
    72.79x = 4,535.87
  5. Step 5: Solve for x
    x = 4,535.87/72.79
  6. Step 6: Final answer
    x = 62.31

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.