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Finding the Fourth Proportional to 538.29, 805.59 and 447.15

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Solution

The fourth proportional to 538.29, 805.59 and 447.15 is: 669.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.29 : 805.59 = 447.15 : x
  2. Step 2: Convert to fraction form
    538.29/805.59 = 447.15/x
  3. Step 3: Cross multiply
    538.29x = 805.59 × 447.15
  4. Step 4: Simplify right side
    538.29x = 360,219.57
  5. Step 5: Solve for x
    x = 360,219.57/538.29
  6. Step 6: Final answer
    x = 669.19

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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.