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Finding the Fourth Proportional to 312.35, 468.57 and 129.87

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Solution

The fourth proportional to 312.35, 468.57 and 129.87 is: 194.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.35 : 468.57 = 129.87 : x
  2. Step 2: Convert to fraction form
    312.35/468.57 = 129.87/x
  3. Step 3: Cross multiply
    312.35x = 468.57 × 129.87
  4. Step 4: Simplify right side
    312.35x = 60,853.19
  5. Step 5: Solve for x
    x = 60,853.19/312.35
  6. Step 6: Final answer
    x = 194.82

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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.