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Finding the Fourth Proportional to 88.81, 122.58 and 72.47

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Solution

The fourth proportional to 88.81, 122.58 and 72.47 is: 100.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.81 : 122.58 = 72.47 : x
  2. Step 2: Convert to fraction form
    88.81/122.58 = 72.47/x
  3. Step 3: Cross multiply
    88.81x = 122.58 × 72.47
  4. Step 4: Simplify right side
    88.81x = 8,883.68
  5. Step 5: Solve for x
    x = 8,883.68/88.81
  6. Step 6: Final answer
    x = 100.03

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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.