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Finding the Fourth Proportional to 624.48, 936.84 and 421.05

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Solution

The fourth proportional to 624.48, 936.84 and 421.05 is: 631.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.48 : 936.84 = 421.05 : x
  2. Step 2: Convert to fraction form
    624.48/936.84 = 421.05/x
  3. Step 3: Cross multiply
    624.48x = 936.84 × 421.05
  4. Step 4: Simplify right side
    624.48x = 394,455.12
  5. Step 5: Solve for x
    x = 394,455.12/624.48
  6. Step 6: Final answer
    x = 631.65

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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.