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Finding the Fourth Proportional to 338.03, 507.91 and 318.35

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Solution

The fourth proportional to 338.03, 507.91 and 318.35 is: 478.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.03 : 507.91 = 318.35 : x
  2. Step 2: Convert to fraction form
    338.03/507.91 = 318.35/x
  3. Step 3: Cross multiply
    338.03x = 507.91 × 318.35
  4. Step 4: Simplify right side
    338.03x = 161,693.62
  5. Step 5: Solve for x
    x = 161,693.62/338.03
  6. Step 6: Final answer
    x = 478.35

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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.