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Finding the Fourth Proportional to 469.85, 703.96 and 421.65

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Solution

The fourth proportional to 469.85, 703.96 and 421.65 is: 631.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.85 : 703.96 = 421.65 : x
  2. Step 2: Convert to fraction form
    469.85/703.96 = 421.65/x
  3. Step 3: Cross multiply
    469.85x = 703.96 × 421.65
  4. Step 4: Simplify right side
    469.85x = 296,823.68
  5. Step 5: Solve for x
    x = 296,823.68/469.85
  6. Step 6: Final answer
    x = 631.75

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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.