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Finding the Fourth Proportional to 405.20, 558.78 and 295.40

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Solution

The fourth proportional to 405.20, 558.78 and 295.40 is: 407.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.20 : 558.78 = 295.40 : x
  2. Step 2: Convert to fraction form
    405.20/558.78 = 295.40/x
  3. Step 3: Cross multiply
    405.20x = 558.78 × 295.40
  4. Step 4: Simplify right side
    405.20x = 165,063.61
  5. Step 5: Solve for x
    x = 165,063.61/405.20
  6. Step 6: Final answer
    x = 407.36

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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.