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Finding the Fourth Proportional to 401.10, 554.26 and 387.42

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Solution

The fourth proportional to 401.10, 554.26 and 387.42 is: 535.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.10 : 554.26 = 387.42 : x
  2. Step 2: Convert to fraction form
    401.10/554.26 = 387.42/x
  3. Step 3: Cross multiply
    401.10x = 554.26 × 387.42
  4. Step 4: Simplify right side
    401.10x = 214,731.41
  5. Step 5: Solve for x
    x = 214,731.41/401.10
  6. Step 6: Final answer
    x = 535.36

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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.