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Finding the Fourth Proportional to 125.00, 172.59 and 81.41

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Solution

The fourth proportional to 125.00, 172.59 and 81.41 is: 112.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.00 : 172.59 = 81.41 : x
  2. Step 2: Convert to fraction form
    125.00/172.59 = 81.41/x
  3. Step 3: Cross multiply
    125.00x = 172.59 × 81.41
  4. Step 4: Simplify right side
    125.00x = 14,050.68
  5. Step 5: Solve for x
    x = 14,050.68/125.00
  6. Step 6: Final answer
    x = 112.40

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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.