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Finding the Fourth Proportional to 541.90, 813.09 and 421.21

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Solution

The fourth proportional to 541.90, 813.09 and 421.21 is: 632.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    541.90 : 813.09 = 421.21 : x
  2. Step 2: Convert to fraction form
    541.90/813.09 = 421.21/x
  3. Step 3: Cross multiply
    541.90x = 813.09 × 421.21
  4. Step 4: Simplify right side
    541.90x = 342,481.64
  5. Step 5: Solve for x
    x = 342,481.64/541.90
  6. Step 6: Final answer
    x = 632.00

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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.