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Finding the Fourth Proportional to 475.21, 655.61 and 288.63

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Solution

The fourth proportional to 475.21, 655.61 and 288.63 is: 398.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.21 : 655.61 = 288.63 : x
  2. Step 2: Convert to fraction form
    475.21/655.61 = 288.63/x
  3. Step 3: Cross multiply
    475.21x = 655.61 × 288.63
  4. Step 4: Simplify right side
    475.21x = 189,223.99
  5. Step 5: Solve for x
    x = 189,223.99/475.21
  6. Step 6: Final answer
    x = 398.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.