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Finding the Fourth Proportional to 99.36, 148.77 and 81

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Solution

The fourth proportional to 99.36, 148.77 and 81 is: 121.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.36 : 148.77 = 81 : x
  2. Step 2: Convert to fraction form
    99.36/148.77 = 81/x
  3. Step 3: Cross multiply
    99.36x = 148.77 × 81
  4. Step 4: Simplify right side
    99.36x = 12,050.37
  5. Step 5: Solve for x
    x = 12,050.37/99.36
  6. Step 6: Final answer
    x = 121.28

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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.