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Finding the Fourth Proportional to 338.45, 507.80 and 146.21

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Solution

The fourth proportional to 338.45, 507.80 and 146.21 is: 219.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.45 : 507.80 = 146.21 : x
  2. Step 2: Convert to fraction form
    338.45/507.80 = 146.21/x
  3. Step 3: Cross multiply
    338.45x = 507.80 × 146.21
  4. Step 4: Simplify right side
    338.45x = 74,244.71
  5. Step 5: Solve for x
    x = 74,244.71/338.45
  6. Step 6: Final answer
    x = 219.37

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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.