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Finding the Fourth Proportional to 212.16, 317.90 and 120.58

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Solution

The fourth proportional to 212.16, 317.90 and 120.58 is: 180.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.16 : 317.90 = 120.58 : x
  2. Step 2: Convert to fraction form
    212.16/317.90 = 120.58/x
  3. Step 3: Cross multiply
    212.16x = 317.90 × 120.58
  4. Step 4: Simplify right side
    212.16x = 38,330.98
  5. Step 5: Solve for x
    x = 38,330.98/212.16
  6. Step 6: Final answer
    x = 180.67

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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.