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Finding the Fourth Proportional to 76.62, 105.54 and 72.04

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Solution

The fourth proportional to 76.62, 105.54 and 72.04 is: 99.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.62 : 105.54 = 72.04 : x
  2. Step 2: Convert to fraction form
    76.62/105.54 = 72.04/x
  3. Step 3: Cross multiply
    76.62x = 105.54 × 72.04
  4. Step 4: Simplify right side
    76.62x = 7,603.10
  5. Step 5: Solve for x
    x = 7,603.10/76.62
  6. Step 6: Final answer
    x = 99.23

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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.