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Finding the Fourth Proportional to 469.68, 645.20 and 403.26

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Solution

The fourth proportional to 469.68, 645.20 and 403.26 is: 553.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.68 : 645.20 = 403.26 : x
  2. Step 2: Convert to fraction form
    469.68/645.20 = 403.26/x
  3. Step 3: Cross multiply
    469.68x = 645.20 × 403.26
  4. Step 4: Simplify right side
    469.68x = 260,181.34
  5. Step 5: Solve for x
    x = 260,181.34/469.68
  6. Step 6: Final answer
    x = 553.95

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.