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Finding the Fourth Proportional to 72.76, 100.30 and 55.28

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Solution

The fourth proportional to 72.76, 100.30 and 55.28 is: 76.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.76 : 100.30 = 55.28 : x
  2. Step 2: Convert to fraction form
    72.76/100.30 = 55.28/x
  3. Step 3: Cross multiply
    72.76x = 100.30 × 55.28
  4. Step 4: Simplify right side
    72.76x = 5,544.58
  5. Step 5: Solve for x
    x = 5,544.58/72.76
  6. Step 6: Final answer
    x = 76.20

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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.