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Finding the Fourth Proportional to 475.20, 712.66 and 215.05

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Solution

The fourth proportional to 475.20, 712.66 and 215.05 is: 322.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.20 : 712.66 = 215.05 : x
  2. Step 2: Convert to fraction form
    475.20/712.66 = 215.05/x
  3. Step 3: Cross multiply
    475.20x = 712.66 × 215.05
  4. Step 4: Simplify right side
    475.20x = 153,257.53
  5. Step 5: Solve for x
    x = 153,257.53/475.20
  6. Step 6: Final answer
    x = 322.51

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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.