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Finding the Fourth Proportional to 338.78, 507.87 and 156.23

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Solution

The fourth proportional to 338.78, 507.87 and 156.23 is: 234.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.78 : 507.87 = 156.23 : x
  2. Step 2: Convert to fraction form
    338.78/507.87 = 156.23/x
  3. Step 3: Cross multiply
    338.78x = 507.87 × 156.23
  4. Step 4: Simplify right side
    338.78x = 79,343.90
  5. Step 5: Solve for x
    x = 79,343.90/338.78
  6. Step 6: Final answer
    x = 234.20

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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.