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Finding the Fourth Proportional to 405, 557.28 and 393.66

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Solution

The fourth proportional to 405, 557.28 and 393.66 is: 541.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    405 : 557.28 = 393.66 : x
  2. Step 2: Convert to fraction form
    405/557.28 = 393.66/x
  3. Step 3: Cross multiply
    405x = 557.28 × 393.66
  4. Step 4: Simplify right side
    405x = 219,378.84
  5. Step 5: Solve for x
    x = 219,378.84/405
  6. Step 6: Final answer
    x = 541.68

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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.