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Finding the Fourth Proportional to 125, 172.52 and 81.43

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Solution

The fourth proportional to 125, 172.52 and 81.43 is: 112.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    125 : 172.52 = 81.43 : x
  2. Step 2: Convert to fraction form
    125/172.52 = 81.43/x
  3. Step 3: Cross multiply
    125x = 172.52 × 81.43
  4. Step 4: Simplify right side
    125x = 14,047.88
  5. Step 5: Solve for x
    x = 14,047.88/125
  6. Step 6: Final answer
    x = 112.38

Related Problems

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1.5x scale

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.