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Finding the Fourth Proportional to 478.74, 662.21 and 472.98

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Solution

The fourth proportional to 478.74, 662.21 and 472.98 is: 654.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.74 : 662.21 = 472.98 : x
  2. Step 2: Convert to fraction form
    478.74/662.21 = 472.98/x
  3. Step 3: Cross multiply
    478.74x = 662.21 × 472.98
  4. Step 4: Simplify right side
    478.74x = 313,212.09
  5. Step 5: Solve for x
    x = 313,212.09/478.74
  6. Step 6: Final answer
    x = 654.24

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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.