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Finding the Fourth Proportional to 400.12, 554.40 and 391.48

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Solution

The fourth proportional to 400.12, 554.40 and 391.48 is: 542.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.12 : 554.40 = 391.48 : x
  2. Step 2: Convert to fraction form
    400.12/554.40 = 391.48/x
  3. Step 3: Cross multiply
    400.12x = 554.40 × 391.48
  4. Step 4: Simplify right side
    400.12x = 217,036.51
  5. Step 5: Solve for x
    x = 217,036.51/400.12
  6. Step 6: Final answer
    x = 542.43

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.