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Finding the Fourth Proportional to 111, 153.23 and 72.20

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Solution

The fourth proportional to 111, 153.23 and 72.20 is: 99.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    111 : 153.23 = 72.20 : x
  2. Step 2: Convert to fraction form
    111/153.23 = 72.20/x
  3. Step 3: Cross multiply
    111x = 153.23 × 72.20
  4. Step 4: Simplify right side
    111x = 11,062.08
  5. Step 5: Solve for x
    x = 11,062.08/111
  6. Step 6: Final answer
    x = 99.66

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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.