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Finding the Fourth Proportional to 521.69, 781.58 and 338.63

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Solution

The fourth proportional to 521.69, 781.58 and 338.63 is: 507.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.69 : 781.58 = 338.63 : x
  2. Step 2: Convert to fraction form
    521.69/781.58 = 338.63/x
  3. Step 3: Cross multiply
    521.69x = 781.58 × 338.63
  4. Step 4: Simplify right side
    521.69x = 264,663.37
  5. Step 5: Solve for x
    x = 264,663.37/521.69
  6. Step 6: Final answer
    x = 507.32

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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.