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Finding the Fourth Proportional to 405.40, 558.30 and 360.76

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Solution

The fourth proportional to 405.40, 558.30 and 360.76 is: 496.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.40 : 558.30 = 360.76 : x
  2. Step 2: Convert to fraction form
    405.40/558.30 = 360.76/x
  3. Step 3: Cross multiply
    405.40x = 558.30 × 360.76
  4. Step 4: Simplify right side
    405.40x = 201,412.31
  5. Step 5: Solve for x
    x = 201,412.31/405.40
  6. Step 6: Final answer
    x = 496.82

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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.