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Finding the Fourth Proportional to 109.94, 164.72 and 71.40

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Solution

The fourth proportional to 109.94, 164.72 and 71.40 is: 106.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.94 : 164.72 = 71.40 : x
  2. Step 2: Convert to fraction form
    109.94/164.72 = 71.40/x
  3. Step 3: Cross multiply
    109.94x = 164.72 × 71.40
  4. Step 4: Simplify right side
    109.94x = 11,761.01
  5. Step 5: Solve for x
    x = 11,761.01/109.94
  6. Step 6: Final answer
    x = 106.98

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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.