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Finding the Fourth Proportional to 459.21, 685.10 and 421.58

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Solution

The fourth proportional to 459.21, 685.10 and 421.58 is: 628.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.21 : 685.10 = 421.58 : x
  2. Step 2: Convert to fraction form
    459.21/685.10 = 421.58/x
  3. Step 3: Cross multiply
    459.21x = 685.10 × 421.58
  4. Step 4: Simplify right side
    459.21x = 288,822.35
  5. Step 5: Solve for x
    x = 288,822.35/459.21
  6. Step 6: Final answer
    x = 628.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.