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Finding the Fourth Proportional to 125.21, 172.67 and 90.47

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Solution

The fourth proportional to 125.21, 172.67 and 90.47 is: 124.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.21 : 172.67 = 90.47 : x
  2. Step 2: Convert to fraction form
    125.21/172.67 = 90.47/x
  3. Step 3: Cross multiply
    125.21x = 172.67 × 90.47
  4. Step 4: Simplify right side
    125.21x = 15,620.14
  5. Step 5: Solve for x
    x = 15,620.14/125.21
  6. Step 6: Final answer
    x = 124.76

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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.