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Finding the Fourth Proportional to 543.06, 813.82 and 420.76

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Solution

The fourth proportional to 543.06, 813.82 and 420.76 is: 630.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.06 : 813.82 = 420.76 : x
  2. Step 2: Convert to fraction form
    543.06/813.82 = 420.76/x
  3. Step 3: Cross multiply
    543.06x = 813.82 × 420.76
  4. Step 4: Simplify right side
    543.06x = 342,422.90
  5. Step 5: Solve for x
    x = 342,422.90/543.06
  6. Step 6: Final answer
    x = 630.54

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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.