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Finding the Fourth Proportional to 469.20, 703.44 and 420.96

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Solution

The fourth proportional to 469.20, 703.44 and 420.96 is: 631.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.20 : 703.44 = 420.96 : x
  2. Step 2: Convert to fraction form
    469.20/703.44 = 420.96/x
  3. Step 3: Cross multiply
    469.20x = 703.44 × 420.96
  4. Step 4: Simplify right side
    469.20x = 296,120.10
  5. Step 5: Solve for x
    x = 296,120.10/469.20
  6. Step 6: Final answer
    x = 631.12

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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.