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Finding the Fourth Proportional to 405.04, 555.30 and 394.16

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Solution

The fourth proportional to 405.04, 555.30 and 394.16 is: 540.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.04 : 555.30 = 394.16 : x
  2. Step 2: Convert to fraction form
    405.04/555.30 = 394.16/x
  3. Step 3: Cross multiply
    405.04x = 555.30 × 394.16
  4. Step 4: Simplify right side
    405.04x = 218,877.05
  5. Step 5: Solve for x
    x = 218,877.05/405.04
  6. Step 6: Final answer
    x = 540.38

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.