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Finding the Fourth Proportional to 543.90, 815.04 and 447.08

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Solution

The fourth proportional to 543.90, 815.04 and 447.08 is: 669.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.90 : 815.04 = 447.08 : x
  2. Step 2: Convert to fraction form
    543.90/815.04 = 447.08/x
  3. Step 3: Cross multiply
    543.90x = 815.04 × 447.08
  4. Step 4: Simplify right side
    543.90x = 364,385.04
  5. Step 5: Solve for x
    x = 364,385.04/543.90
  6. Step 6: Final answer
    x = 669.95

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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.