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Finding the Fourth Proportional to 338.99, 508.91 and 261.86

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Solution

The fourth proportional to 338.99, 508.91 and 261.86 is: 393.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.99 : 508.91 = 261.86 : x
  2. Step 2: Convert to fraction form
    338.99/508.91 = 261.86/x
  3. Step 3: Cross multiply
    338.99x = 508.91 × 261.86
  4. Step 4: Simplify right side
    338.99x = 133,259.32
  5. Step 5: Solve for x
    x = 133,259.32/338.99
  6. Step 6: Final answer
    x = 393.11

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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.