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Finding the Fourth Proportional to 338.99, 508.05 and 143.91

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Solution

The fourth proportional to 338.99, 508.05 and 143.91 is: 215.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.99 : 508.05 = 143.91 : x
  2. Step 2: Convert to fraction form
    338.99/508.05 = 143.91/x
  3. Step 3: Cross multiply
    338.99x = 508.05 × 143.91
  4. Step 4: Simplify right side
    338.99x = 73,113.48
  5. Step 5: Solve for x
    x = 73,113.48/338.99
  6. Step 6: Final answer
    x = 215.68

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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.