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Finding the Fourth Proportional to 312.42, 468.91 and 120.18

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Solution

The fourth proportional to 312.42, 468.91 and 120.18 is: 180.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.42 : 468.91 = 120.18 : x
  2. Step 2: Convert to fraction form
    312.42/468.91 = 120.18/x
  3. Step 3: Cross multiply
    312.42x = 468.91 × 120.18
  4. Step 4: Simplify right side
    312.42x = 56,354.84
  5. Step 5: Solve for x
    x = 56,354.84/312.42
  6. Step 6: Final answer
    x = 180.38

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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.