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Finding the Fourth Proportional to 474.55, 654.90 and 287.98

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Solution

The fourth proportional to 474.55, 654.90 and 287.98 is: 397.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.55 : 654.90 = 287.98 : x
  2. Step 2: Convert to fraction form
    474.55/654.90 = 287.98/x
  3. Step 3: Cross multiply
    474.55x = 654.90 × 287.98
  4. Step 4: Simplify right side
    474.55x = 188,598.10
  5. Step 5: Solve for x
    x = 188,598.10/474.55
  6. Step 6: Final answer
    x = 397.43

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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.