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Finding the Fourth Proportional to 110.40, 152.40 and 71.64

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Solution

The fourth proportional to 110.40, 152.40 and 71.64 is: 98.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.40 : 152.40 = 71.64 : x
  2. Step 2: Convert to fraction form
    110.40/152.40 = 71.64/x
  3. Step 3: Cross multiply
    110.40x = 152.40 × 71.64
  4. Step 4: Simplify right side
    110.40x = 10,917.94
  5. Step 5: Solve for x
    x = 10,917.94/110.40
  6. Step 6: Final answer
    x = 98.89

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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.