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Finding the Fourth Proportional to 474.23, 654.48 and 287.78

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Solution

The fourth proportional to 474.23, 654.48 and 287.78 is: 397.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.23 : 654.48 = 287.78 : x
  2. Step 2: Convert to fraction form
    474.23/654.48 = 287.78/x
  3. Step 3: Cross multiply
    474.23x = 654.48 × 287.78
  4. Step 4: Simplify right side
    474.23x = 188,342.98
  5. Step 5: Solve for x
    x = 188,342.98/474.23
  6. Step 6: Final answer
    x = 397.16

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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.