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Finding the Fourth Proportional to 312.53, 468.26 and 138.93

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Solution

The fourth proportional to 312.53, 468.26 and 138.93 is: 208.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.53 : 468.26 = 138.93 : x
  2. Step 2: Convert to fraction form
    312.53/468.26 = 138.93/x
  3. Step 3: Cross multiply
    312.53x = 468.26 × 138.93
  4. Step 4: Simplify right side
    312.53x = 65,053.43
  5. Step 5: Solve for x
    x = 65,053.43/312.53
  6. Step 6: Final answer
    x = 208.15

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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.