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Finding the Fourth Proportional to 400.56, 551.60 and 392.40

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Solution

The fourth proportional to 400.56, 551.60 and 392.40 is: 540.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.56 : 551.60 = 392.40 : x
  2. Step 2: Convert to fraction form
    400.56/551.60 = 392.40/x
  3. Step 3: Cross multiply
    400.56x = 551.60 × 392.40
  4. Step 4: Simplify right side
    400.56x = 216,447.84
  5. Step 5: Solve for x
    x = 216,447.84/400.56
  6. Step 6: Final answer
    x = 540.36

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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.