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Finding the Fourth Proportional to 549.70, 823.11 and 421.54

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Solution

The fourth proportional to 549.70, 823.11 and 421.54 is: 631.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.70 : 823.11 = 421.54 : x
  2. Step 2: Convert to fraction form
    549.70/823.11 = 421.54/x
  3. Step 3: Cross multiply
    549.70x = 823.11 × 421.54
  4. Step 4: Simplify right side
    549.70x = 346,973.79
  5. Step 5: Solve for x
    x = 346,973.79/549.70
  6. Step 6: Final answer
    x = 631.21

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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.