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Finding the Fourth Proportional to 478.22, 716.38 and 315.41

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Solution

The fourth proportional to 478.22, 716.38 and 315.41 is: 472.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.22 : 716.38 = 315.41 : x
  2. Step 2: Convert to fraction form
    478.22/716.38 = 315.41/x
  3. Step 3: Cross multiply
    478.22x = 716.38 × 315.41
  4. Step 4: Simplify right side
    478.22x = 225,953.42
  5. Step 5: Solve for x
    x = 225,953.42/478.22
  6. Step 6: Final answer
    x = 472.49

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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.