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Finding the Fourth Proportional to 175.53, 263.30 and 72.78

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Solution

The fourth proportional to 175.53, 263.30 and 72.78 is: 109.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    175.53 : 263.30 = 72.78 : x
  2. Step 2: Convert to fraction form
    175.53/263.30 = 72.78/x
  3. Step 3: Cross multiply
    175.53x = 263.30 × 72.78
  4. Step 4: Simplify right side
    175.53x = 19,163.10
  5. Step 5: Solve for x
    x = 19,163.10/175.53
  6. Step 6: Final answer
    x = 109.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.