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Finding the Fourth Proportional to 212.21, 292.81 and 124.90

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Solution

The fourth proportional to 212.21, 292.81 and 124.90 is: 172.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.21 : 292.81 = 124.90 : x
  2. Step 2: Convert to fraction form
    212.21/292.81 = 124.90/x
  3. Step 3: Cross multiply
    212.21x = 292.81 × 124.90
  4. Step 4: Simplify right side
    212.21x = 36,570.50
  5. Step 5: Solve for x
    x = 36,570.50/212.21
  6. Step 6: Final answer
    x = 172.33

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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.