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Finding the Fourth Proportional to 462.64, 638.42 and 287.98

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Solution

The fourth proportional to 462.64, 638.42 and 287.98 is: 397.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.64 : 638.42 = 287.98 : x
  2. Step 2: Convert to fraction form
    462.64/638.42 = 287.98/x
  3. Step 3: Cross multiply
    462.64x = 638.42 × 287.98
  4. Step 4: Simplify right side
    462.64x = 183,852.19
  5. Step 5: Solve for x
    x = 183,852.19/462.64
  6. Step 6: Final answer
    x = 397.40

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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.