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Finding the Fourth Proportional to 478.32, 716.85 and 218.36

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Solution

The fourth proportional to 478.32, 716.85 and 218.36 is: 327.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.32 : 716.85 = 218.36 : x
  2. Step 2: Convert to fraction form
    478.32/716.85 = 218.36/x
  3. Step 3: Cross multiply
    478.32x = 716.85 × 218.36
  4. Step 4: Simplify right side
    478.32x = 156,527.78
  5. Step 5: Solve for x
    x = 156,527.78/478.32
  6. Step 6: Final answer
    x = 327.24

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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.